hey dude, people will use them as actual money when there is something they can buy for btc
so if you want to contribute to minimize speculations just offer your goods/service for btc
You would be stupid to do this.
I can't think of any reason why any seller of any good would accept bitcoin. It is way too volatile to set a price. You sell a good one day for 1 btc, and the next day you see that the btc value took a bad hit. I do a lot of business online selling parts and I would never accept bitcoin in this environment.
Key word is
this environment. Hopefully it changes in the future, but stabilization will come in the long term like another poster said.