Earlier quoted context omitted.
The pro account is the best idea. Stay away from advertising, IMO, it looks cheap and turns people off. Personally I absolutely hate advertising and won't use any site with it. And I doubt much would come from the book idea/affiliations. I would take it nice and slow. Wait until you have some serious users who have put a lot of time into the app. Obviously you and your friends have to catalyse that, looks like you al…
> Stay away from advertising, IMO, it looks cheap and turns people off. Personally I absolutely hate advertising and won't use any site with it. I don't like ads either, but we (who actually care enough to e.g. install ad block+) are a minority. You need money. Advertisement might help and it will only repulse a relatively small portion of the population.
Try them out, and see if they work, and see if your users find them useful, or horrible.
Also do the maths - how many Pro accounts would you need to sell to make the same amount as sticking a couple of adverts up?