I wish I had. I set up my computer to mine about 8 years ago, but shut it down after a few days of nothing. I could have left it running for a month and even if I would have found one hash (25 bitcoins) it would have more than paid for itself.
Crypto-currencies are a great and much needed concept, but right now the most popular one (Bitcoin) is super inflated. Most of it is held by Chinese companies. Few transactions take place other than currency exchanges. Having fifty BTC means you’re potentially rich, but the mere act of trying to sell them for $$ will be a long process and have an actual affect on the market, since no one’s buying.
Ethereum is looking a little better right now, but it’s also a wee bit inflated.