You don't have to buy a whole coin, you can buy as little as $1 worth generally. I bought $1000 worth of bitcoin/ethereum/litecoin/bitcoin-cash just a week ago and am up to $1350 already. Now it can drop down to $5 tomorrow, but the point is if you just throw a bit of play money at it you can invest without much worry. EDIT: in fact, I expect it to correct at some point, the past few weeks have been straight up which isn't normal for anything. Waiting for the dip may be the way to go. But even after the dip its so volatile that it could dip further. So I'm just going to dollar cost average it.