However, if someone who has completed his arena is able to compete with minimum salary, he would be punished exactly the same way people who are actually tanking. If someone is able to accumulate cash while competing he shouldn't be affected by measures designed to tackle tanking.
I'm exactly in this situation, I'm under the minimum salary and was able to play PO last 2 seasons. Anyway, I don't see where my team will be affected with the luxury tax. I guess under 10 millions in bank, it won't be taxed... The limit is maybe even higher...