Well, if you are looking to get people to pay with bit coins you might want to advertise on the various sites that give out free bit coins. Those people are likely to have them. As for getting people to use bit coins as opposed to other payment methods you might consider pushing the fact that they can be gotten for free from places or even a discount to encourage their use. Another thing to consider, if you have control of such things, is making bit coin the default option when people go to order. Put the prices in bit coins in larger bold text in the adds with the other values in smaller text. When they go to check out make the bit coin option pop up in the ordering stuff so that they have to actively choose something else. Do not do it in such a way as to make it hard to chose something else, but make sure that they are reminded that bit coins exist. They may navigate past it a dozen times, but each time they will get more and more used to seeing it. They might eventually get curious enough to look into it and join the bit coin using community. No matter what, if they get used to seeing it it will become more accepted in their minds as a normal thing and that makes them feel more comfortable using it.