Well, I don't know about the singles and album's but you can either sell tickets for the minimum which does boost your sales but won't affect your popularity majorly, so you can sell out stadiums easier yes but you won't make as much money, or you can charge more and make more money but you'll have a harder time getting to that lovely 100% sales :) But really it's up to you - like it says on the home page, you can be reeally rich or sell the most tickets, down to how you see your band. Also, if you really want to get involved you could sell them cheap because your band's 'for the people' and rp that in the forums or vica versa, but most people keep them separate aside from releasing material and getting a bearing on how popular you are.

Hope that helped.

No worries dude :D