No, but that's because I really love the experience of training the dog myself. Having it pre-trained would take the fun out of owning the dog for me. (Not to say that once my dog has basic manners, it's not fun. I just like doing it, so why would I pay someone else?)
Also, I'm insanely picky with what and how my dog is taught, so that may be an issue. There's only one other person I personally know who I would trust to do it the way I like.
And for agility or other sports? No. I'm the kind of person who likes to see what goes on to get to the point something's at. The dog has amazing contacts? I want to see the process it took to get there. The dog jumps like a flying tank? Again, I want to see why.
There's definitely the awkward while where both dog and handler are giant clutzes, but I guess I always thought the point of the sports was to demonstrate what you have done with your dog. Dog sports mean different things to different people, of course.