We enjoying maintaining tanks so much that we
do get paid to do it! That being said our own tanks do suffer a little because of it....
This question is really similar to many hobbies, like gardening, some people get landscapers to do their garden and some wouldn't dream of it!
If I had the money I think I would get someone in to do some maintenance on my tanks, but I enjoy aquascaping and coral pruning myself. Coral and fish selection would be my own choice, but I would not shy away from someone making knowledgeable suggestions to me!
-Diana