realtors per hour

Why not pay the realtors per hour as well, and not percentage of sales (actually 3% of sale per side)? If they are professionals, then they should be paid just like other pros e.g. lawyers etc. This would also allow me to work with more than realtor at a time, to get different opinions/services.

I think any service a realtor provides should be hourly based, be it market data, buying, marketing a house, advertisements for selling a house, writing and reviewing contracts and even going to closing with the buyer or seller.