How is it a "ripoff?"
First of all, as @bdietz20 said, you are told right off the bat that if you join, you'll be knocked down to Neighborhood League.
Secondly, you get a large number of golden tickets if you compete (I think it's 10) and extra platinum keys for your troubles.
Third, all you have to do to unlock each building is get promoted. You don't even have to rank at the top, just high enough to get promoted to the next league.
Fourth, like that old Rolling Stones song goes, "You can't always get what you want." If work is getting in the way of you completing all the high end assignments in time, well, that's life. Disappointing, I know, but not a "rip off."