IMO, selling a player for "too high" of a price should only count as cheating if there's a preponderance of evidence that the purchasing team was related to the selling team -- you transferred money between your two accounts.
If the purchasing team is just some random other team, the seller shouldn't be punished for either patiently waiting to catch someone who really valued the player (or someone doing a showcase and getting his player scooped by some anti-NT farm or whatever shouldn't be punished by losing both his player and the bulk of the money from the sale, even if that anti-NT farm account turns out to be a multi account of some other player that the selling team is not related to).
Personally, I see the stories about people getting fined (or I see people trying to start a witch hunt to get someone fined) just because a player happened to go higher than what was thought of as a "fair price", even though the selling team clearly had no ill intention to sell the player for that. Like say the ATG player frenzy that happened on a few of the US ATG draftees this season - some of them pushed up to 6-7M+ even though the general consensus among US NT trainers & scouts was that 3-4M was more reasonable... but the push up in price came strictly from unrelated teams bidding against each other, with no bad faith by the selling manager. I'm not aware of any of those specific examples generating fines in this go-around, but if they _had_, I'd be very much opposed to those fines.