Because it is better to have a hope than having only few dollars. 99% loss means that you are not selling but giving away your tokens almost for free!
Well i am holding so many shitcoin that i get from bounty campaign because i am still hoping that there price will rise slowly, and my other reason why i am not selling my shitcoin is i am believing that 2020 will be the best year for all altcoins.
Even if a very good year with altcoin appears, I still don't think your shitcoin will have a good value because as the name you call it, that's enough to talk about its value, it certainly has problems, and that's why it still can't raise prices, it's not even listed on exchanges. You can look at the history of lots of shitcoin, almost falling, very few shitcoin can revive vigorously, continuing to hold will only make us receive more trash in our wallets, instead of doing so, we should sell these shitcoin as soon as possible, less money is better than no money