I felt the same way as you and I built a site that aggregates accommodations, including absolutely everything, not just companies paying commmissions. We have couchsurfing, Airbnb, all the main hotel sites, Groupon, Hotwire, and most other sites you might ever bother checking. It's called http://AllTheRooms.com.
+1 for alltherooms.com being a good service, it's my go-to for accommodation booking. Seriously, being able compare even couchsurfing options is a godsend.
