I will name two main reasons why people keep holding shitcoins. First, because they can not be traded. Due to not being listed, or because they are locked: locked with devs and the project is abandoned, or locked and shitcoin holder must do several actions to unlock them, like buy something. Second and most modern problem - transaction fee cost more then user will get from selling, or trading them wont bring good money. For example I have bunch of altcoins $5-10 worth each, but transaction fee will cost $4-9. I will hold them, instead spending time to earn $1.
it's like being stuck to have shitcoin in our wallet. however, another reason, and this is my personal reason, sometimes for the ERC20 wallet, sometimes the shit tokens that I keep have a price at a later date. although it's not much, but I think that it's okay to hold the shit coin as long as it doesn't bother me. most shitcoins are obtained from airdrops, and that is why many people hold the coins to this day and hope that the project of the coin or token makes the token value.
