Yes, I think we can't really treat coins worth less than dollar as coins. They are very weak and unlikely to grow in price a lot. It is better to choose from the coins already growing and costing at least a few dollars. And all this is not a long-term investment anyway, so one has to be very attentive on the price changes if investing is worthless coins. You can still lose quite a lot of money out of imagining what big sums you can earn.