Simply because they have no value, and you don't sell it anywhere. Some may sell but prices are too small for us to trade. So I think it's a reluctance to keep those altcoins in my wallet.
agree, because the coin does not have a price so I cannot sell the coin and keep holding the coin, but I still hope that my shitcoin price will increase, because I see the project still running even though the progress of the project is very slow and when the project was successful and investors began to be interested to investing in the project, I hope the price of the coin will increase and give me profit.