For those of you that find a store like this, see the sale prices of items you owned as a kid, and remember how little you paid for those items in comparison, don't think you made a mistake by NOT keeping your old toys. I did, and it was the wrong choice.
I moved boxes of old 80s action figures and vehicles around from house to house, apartment to apartment, years in a paid storage space, only to later finally sell nearly everything at the "high sale prices". The amount of bother over the decades, amount of time needed to prep things for sale, find buyers, etc was a small fraction of a payoff compared to what I could have done with my time and money over the years.
If you made it to adulthood without all your old toys, you made the right choice.