Because the hope is still alive, smart people that are promoting projects do not care about short term profit and hope that within several years, those tokens would increase in price and not fall below the sale price by 10 times.
It's too impossible to have more hope on these projects nowadays because the trendy scams everywhere is unstoppable. It doesn't matter if they end up in a good exchanges because the price of that project will eventually plummet because people starts to dump everything.