you don't know how long it takes them to do anything though.
hourly rates are one thing, but unless they've got reasonable time frames for building stuff, it doesn't really matter.
I typically charge 3-5x what 'regular' web developers do, and I catch flak for that from some potential clients. I also tend to get stuff done 5-10x faster than many other 'regular' web developers too, so I don't have any issues justifying myself. The people that care about hourly rates move on, the people that care about getting their problem solved quickly stay.
I imagine Oracle's got 'standard' implementation timelines for common scenarios.