I would think it depends not so much on whether your users can afford it, but whether you can sustain development on $2.95/month. The price difference between

I would think it depends not so much on whether your users can afford it, but whether you can sustain development on $2.95/month. The price difference between 0 and 0.01 is huge, but between $2.95 to $8.95 is minimal. If you are going to charge for it, charge for it so you can keep supporting it.