You make a good point. I just dont like the idea of that becomming something we'll have to do someday if does become a regular.
I myself too, will probably end up picking up of something like Wild Guns someday down the line, but I at least know that my repro will be sitting on my shelf forever. Or at least untill I find a real one, in the event that I ever do. In that case I would probably just pass the repro on to my roommate to hold onto for the same reason.
Yeah, I'm not looking forward to the extra work it would take to authenticate something like that. Sounds like a another service for the VGA to offer :/ Shit, I shouldn't have said that. Fuck you, it's my idea, I'm gonna start authenticating legitimacy! I'll call it "Is this shit for real, yo?!©" authentication service. It's my idea. You can't have it

I like how no one is thinking of how a Little Samson repro could be abused.
Its simple to say the biggest reasons why most repro makes wont make retail games because, really at this day and age, Little Samson repros are the last thing we need floating around as retail copies.
Do we really need a site that sais "Hey, Ill make you what ever you want, retail or not"? Then everyone floods with orders saying "Hey, make me Little Samson, Bubble Bobble 2, Power Blade 2 and Flinstones 2". Sure alot of people will be happy to actually be able to give this a play on there NES for a reasonable price and will probably keep it for them selves.
But what about all the people who choose to abuse this service? (And there will be some!) You dont think at some point or another, someone is going to try ripping people off passing these off as real? I know theres a handfull of us here here that could certainly recreate a retail label with ease. Then just find yourself the highest quality paper/printer, and you can bang out labels that would be hard to tell the difference to the untrained eye. Hell, every time I get a new repro game in, I pass it around to all my friends to check out (gamer/collector or not) since I make my own labels. Even some of my friends who actually retro collect cant even tell its a repro untill I tell them it is or the recognize the game and know its repro. I cant tell you how many times Ive had people in my game room and tell me "What? When did we ever get Secret of Mana 2?" Open up my case, admire it for a few minutes and have no idea what they were holding was actually a repro cart.
And if you sold any of those games for half of what their actually worth, youd still make a killing. I dont think thats something any repro maker wants to be a part of. And how good would it looked if it actually happened, and you were the one to make the cart? If I made repros, I dont know that Id be comfortable building Little Samson carts for strangers on a regular basis...
Like I said, I love repros and I do understand why people would want repros of retail games. But I dont think it makes it a good idea to just open up the doors so everyone can buy any super rare retail cart the want. They'd be flying out the door all over the place. It doesnt take longer than a few seconds to realize how bad and fast that situation could get...
This could go the other way as well. Look at reproduction Cobra bodies. They haven't affected the value of legit Shelby Cobras and yet they have found their place in the market. I think retail repros could end up the same way. If legitimacy becomes a concern, then we'll just do what car collectors do; inspect, inspect, inspect. Does it make things more tedious and time consuming? Maybe initially, but as the market becomes aware of this sort of thing, then the people trying to pass off repro as legit should dwindle and their reputations will follow them in a market and community this tight.
I don't really want any repro retail games at the moment, but I'm not far from considering it with so many games like Wild Guns, Metal Warriors, Aero Fighters, Hagane, etc. arriving at prices that I won't EVER consider paying.
There will always be purists who poo-poo the idea (it honestly doesn't sit really well with me either), but it's starting to look like the only option for some of what I want in my collection 
Just saying that repro Cobra is easier to spot than Repro cart in ebay or Amazon.
I have no problem buying repro versions of retail games if they work, are cheaper and I know that they are repros.
You sloppy quoting bastard. Yes, I agree 100000% percent. If
I were to offer retail repros, they'd go for no more than any other comparable repro. There's no reason to charge a premium. It's the exact same amount of work as any other repro.
I just used the Cobra for comparison. Obviously that sort of purchase is on a vastly different plane. There's no such thing as a 500K+ SNES game (yet). But with prices going the way they are, you better believe that people are going to be taking a LOT more precautions before plunking down their $$$ with only a grainy cell phone pic to use as basis for condition and legitimacy.