This was and is a money grabbing decision by Nordeus and no other reason. Its a disgrace as a business decision it will in the long run make no sense or profit. Basically they are hoping to catch a few fools who wont understand until its too late. This is a game killer decision.
All Nordeus needed to do to fix the apparent problem was to make negos between same and +/- 1 level and make a player bought through negotiation could only be bought/sold once. Simple , effective and problem solved.