Is it a terrible idea to buy a used rental board?

They only rent those boards out in summer and I have a feeling that they only bought them this year. It looks cleaner/newer than my own board. Fins and paint all looks intact just like new boards, no rust on screws. They do leave it in the blazing sun upside down all day so that might be very bad for the board. Also it might be hard to tell if the board has been repaired. I know I'll be using it for years and I should just get a new one, but I know it will get dings and dent in the subway. Also I can't rinse it with fresh water after every session so I think getting a used board would be a wise decision.