Yes, I have about $100 in Bitcoin and today was a bad day. It droppped from around $630 to around $580. Am I a speculator? I guess, but my excuse is that I'm very interested in the underlying technology and there's nothing like having some to getting a feel for the space. Here's a great article about Bitcoin Mining.
Bitcoins are mined by a decentralized network of computers that guess solutions to a mathematical puzzle. As part of that process, miners keep track of and verify all transactions on the bitcoin network, so bitcoins are a kind of compensation for maintaining the ledger of transactions. The faster a person's computer system can find solutions relative to the rest of the network, the better chance he or she has of being awarded bitcoins.