>>52326113When selling as a bulk lot, you typically price at around 60-80% of market price. And that's assuming your cards are NM. If not, I would get the total price of the cards at LP-MP value, and then take 60-80% of that as your listing price. Unless the set is something special and rare, you typically price lower on sets because the buyer will likely be purchasing some cards they already have.
And yes, there will always be demand for the older cards. The only thing is that as the years progress more and more people will be priced out of them and your pool of buyers will shrink. Like sports cards, everyone wants a mantle card or a jeter or a gretzky, but only boomers can afford that now. Same thing with your charizarderino.