Antiques are rare that's why they've become valuable but shitcoins aren't rare and its developers just used that to create money. So even you keep those shitcoins it won't have a decent value unless its developer is active and paying attention to their product but if it's not, don't hope for nothing.

But you can keep it and look at it so there's something that will remind you to be cautious in buying. Treat it as token of appreciation.