That lot is worth $100+. I could see a re-seller dropping $100-$150 for the lot, in a store setting they would make it all back plus more.
from the stores locally here, here's what i've seen those games go for, roughly.
darkwing duck $10
adventure island 1,2 $8, $12
castlevania 1,2,3 (2 has box, and i believe the booklet) $10, $8, $15
tmnt 1,2,3 (1 has box and booklet) $12, $10, $12
kirbys adventure $20
ninja gaiden 1,2,3 $12, $12, $20
megaman 2,3 $18, $14
contra $10
super c $10
final fantasy $15
battletoads/double dragon (nes version not snes) $30
battletoads(with box and book in perfect condition) $12
bubblebobble $20
monopoly(with box and booklet) $5
tecmobowl(withbox and booklet) $4
punchout(mr dream)(with box/inserts) $12
the little mermaid(with box) $10
bible adventures(with box and booklet) $20
tetris1,2(both with box and booklet) $3, $6
yoshi(with box and booklet) $7
caesars palace(with box and booklet) $6
keep in mind, these are all in a store setting. they be less on craigslist, ebay could go either way.