When I was a bit younger and didn't know much about investment, I put together a bitcoin mining PC for about $700 with money I made from a summer job. The value of the coins wobbled like crazy over spans of weeks. Overall my total revenue on this little project was about $1200, before I decided a)the volatility was too unsettling and b)the amount of money I was making per day was no longer worth having a loud whirring PC on in my room 24/7, so I stopped mining. For all the living arrangements while doing it, my electric cost was included in the rent.
With my $500 profit I bought a hard drive and solid state drive, more ram, upgraded the motherboard and processor to convert it into a gaming machine and sold the components I didn't need any more. It's the PC I'm using to write this message to you :)
At this point I wouldn't recommend investing more than a few bucks for giggles. Not too long ago the biggest bitcoin exchange went bankrupt and lots of people lost money. The volatility is nasty. I feel like a currency with such wild volatility is a poor form of currency, but what do I know.