Why order the real drums?
First of all, nothing in computer world can replace a real human drummer feel.
Secondly, a realistic drum sound cannot be reproduced by a drum sampler since a drum set "sounds" as a single complex acoustical instrument: this makes it impossible to recreate such sound by means of discrete sampled drum hits delivered by sample libraries.
Thirdly, organizing drum recording on your own is usually quite expensive: you have to hire a good drummer, book a studio, make sure drums there are good-quality ones, drums are tuned to their best state and microphones are placed optimally around the kit.
We are doing all this in our service, but since the process is streamlined the cost can be kept reasonably low.