Several people have told me that now. Consider it part of the next update if possible
Definitely have a play with pricing, but make sure to remember that if you have three times the sales at one third of the price, all you've done is increased your support costs :)
Yes, exactly right. Your ideal strategy is raise the price to what the market will bear, then back-off a little bit, if sales start to drop off.
You should also take note of all feedback, since your customers are the people that are willing to spend a relatively high price for perceived utility.
If you are responsive to feedback, that is in itself quite a good prospect for users, and that is a lot easier at small scale, than it is if you have 1000's of users.
Definitely have a play with pricing, but make sure to remember that if you have three times the sales at one third of the price, all you've done is increased your support costs :)