You are delusional if you think that this has never happened before and will stop happening because you think it is unethical.
There are some very unethical people in some very unethical Clubs and it will always be that way.
If parents out there think that this is unethical, then they won't come to a Club that offers such "incentives" but if their kid is being promised a better div, more court time, while they are saving money, they will more than likely go.
But any Club that supports loyalty from within would never take this sort of action as it promotes dis-loyatly. How do you know that in 2 years time, that kid will not find another similar deal elsewhere?