There is a market, but typically pretty slim. However very few are worth much of anything, especially if they're not boxed as most people that do collect old PC games prefer the boxes.
I collect old big box PC games, but don't have a whole lot of money budgeted for it (I mainly budget for thrift store finds). But post what you have if it isn't too much work. Maybe do a post in the trading forum and link it here. Someone might be interested.