The miners mine and hold, other mine and sell.
Investors and speculators buy, hold and sell.
You can buy random items in auctions and through the forums.
What are the reasons for the bulk of the bitcoin transfers? I read an article underlying the "dark side" of the internet and TOR network, and they seem to point out that bitcoins are now nearly the exclusive currency for the online "black market" (Note, they are not saying bitcoins are exclusively used for black market transactions)
What have you used bitcoins for?
Miner
Investor
Black Market
Other - explain
I'm using it for meeting my needs. I earns alt coin and convert it bitcoin because it is faster to earn in terms of alt coin than bitcoin directly. I convert it to bitcoin for my wallet to be able to process it since my wallet only process bitcoin to my local currency and vice versa. I haven't tried investing in bitcoin because I'm more of joining in signature campaign. There you can earn even without investing a big amount of money. Risk are also lesser than the other methods known to the community.