I highly doubt that anyone is going to trade a Kirby game or Mega Man Game for Super Mario World + All Stars unless they just like to butt rape themselves...
"Edit":
Sorry I Stand corrected... I didn't realize SNES Mario games were going that high. I pick them up anywhere between $1-6 often enough that I didn't ever bother to look them up.
Though, you still won't get MM X2, X3, 7, Soccor, or Kirby's Dreamland 3 for that offer.