It's hard to tell for real. I would go on eBay and check what the trending prices are and what they have sold for, not just what they have been listed for. I feel like The 64 and Dreamcast with those original boxes could start at $100 a piece. The genesis about $35 - $50. The rest I haven't been in the market for so can't say for real. But check out eBay for what they are actually selling for to get a general idea. Last year I bought an og genesis with streets of rage, all the sonic games, and about 5 other games with 2 controllers for $80 - $100 ( I don't remember the exact amount) There really isn't a lot of resale value in games. You have to have something really special and rare to see any profit.