I think you still don't get it.
Yes, I can pay three salaries for a player I bought before playoff, win, and sell him. But I don't pay a player whose salary exceeds payroll of my whole roster! I will not buy two 500k players and pay 3 million in three weeks. I can't afford that.
You still pay for the money needed to win the bid though. MONEY IS STILL SPENT.
The same principle is still there.
No it's not, because you sell the player immediately after the B3 game and with 30% of taxes, you lose what...300 or 400k? Actually you lose less than the salary of the player.
Now imagine the same player is bought by a team for the playoffs. In addition to those 400k lost because of sell taxes, he has to pay him 1,5 million for three weeks he needs him to win the finals.
Are you really telling me there is no difference???