I hardly think it needs to be done so often. If you do that often, it is best that you do it before the oil change because you will be leaving a lot of junk behind in the oil. Doing this ocasionally isn't much of a problem, but doing it all the time would be rough on the oil.
In my opinion, doing this every 10,000 to 15,000 miles is still agressive. You will certainly benefit from just cleaning the throttle body more often though.
