If someone wants to sell a service IN game...with currency...IN GAME...then No. nothing wrong with it.
If you are lazy, or dont have friends to help you...there is nothing wrong with paying for help. I think its sad...cause you could just keep trying for free.

But it is role playing. If you can't fix a pipe in real life...you hire someone. It uses in game mechanics...not real world transactions. if they SPAM the sale of it...then spam should be limited. I dont think ANYONE should be able to spam 100 messages over and over.