I want to start a product because I think it'll be useful and I have bills to pay, I concern myself with user privacy first and foremost when designing and I don't want to fall into the trap of doing an "apple design". I don't want to scale either, I want to have a healthy and slow growth, maybe not even grow beyond a point. From a pure business standpoint these things are irrational (except paying bills) but personally I find them important.