Missed part of the discussion, still I want to come back to one of your earlier points:
"... always be cheating ... no reason not to develop the game ..."
I wholeheartedly agree BUT - the benefit of a development has to outweigh the gain for possible cheating.
You can buy any player AFTER the draft if a team is willing to part with him. There´s a HUGE market with an enormous variety of players in all price ranges. Therefore the gain for the "buying" team is probably close to non-existent if we consider the huge gambling factor in acquiring ANY player based on a scouting report. The chance to fail is huge (different from the TL, where the chance to fail is inside the buying manager´s head only).
The great benefit would be on the sellers side, who can make money without risking anything, they don´t have to spend any scouting points, they simply can generate money out of virtually nothing.
In addition, the option for cheating is obvious. It´s there and hard to deny. It´s a money transfer tool, which is VERY hard to overview or to check for the GM staff. You either make fixed prices, if there´s no buyer, there´s no sale, first one to bid wins. Or you make acutions, which is a bad idea as mentioned before.
So although your suggestion is one of the best concerning selling draft picks, it opens more bad ways of using it than it does good from my point of view.
Zwei Dinge sind unendlich, die Dummheit und das All...