I would pay quite the price (over $70) for games like Double Dragon 2, Dracula X, River City Ransom, Vasteel US and Dungeon Explorer 2 US maybe.
I also buy (mostly Japanese) Neo Geo AES carts, so I have a different way of seeing game prices, lol. Even so, the most I have paid in the past couple of years was: $80 Real Bout Fatal Fatal Fury, $90 Real Bout Special, $110 Real Bout 2, $200 Last Blade 2 and $180 for Art of Fighting 3 all mint-near mint. This was over a 4-5 year span with patient shopping though.
Typically, the most I pay is $65 after tax for current gen games every 2-3 months. I usually buy current gen games used on the cheap, like Bayonetta, Killzone 2, 3, Uncharted 1 and 2, MGS4 and such.