That's a great point. 

sMiles earns money in several ways - which we then convert into BTC to give back to users:
1. Ads (not intrusive)
2. Paid surveys
3. User Shopping

I agree that there are too many ads oftentimes, with users traditionally receiving $0 for viewing them. At the same time we have to realize that ads are a part of how products can remain free to use.

We want to give users the best way earn bitcoin in as many ways as possible, including paying you for your attention (ads).