Not a good idea
I purchased a discount deal for a Sky Wash service and frozen yogurt. While the wash itself was good, the service was horrible. When I pulled in, no one was there to explain where to go or what I was supposed to do. I pulled up to the where it looked like I should go and the gentleman instructed me to wait inside. No one said where my car would come out, how long it would take, who to tip, or anything about the frozen yogurt. When I went inside, I found that the frozen yogurt was not present. I'm not sure if this was because I arrived late in the day but perhaps that was the reason. I didn't really care about that but it would have been nice if someone had explained that or if there had been a sign... just something.
I waited a bit for my car and they did a good job with that portion of the deal. I don't think I would pay $50 for it though, maybe $20? When I went to leave, I had to ask who to tip because there was no indication and no one said anything.
Maybe they were rushed because it was the end of the day and everyone was tired but I definitely will not buy another deal to this place and I would never pay full price for their services.