Jack you know better than asking that question. Mods make bannings all the time for all number of reasons.
Pretty much as has already been stated -
1. Renegged on a deal he had agreed to. "Because he couldn't afford it" He was also making an offer to amember at the same time.
2. AT the same time was stuffing another member around making offers, retracting, adding cards, removing cards, the deal was posted but he never agreed to it.
3. Within 3-5 days of renegging on the deal, he was able to afford the Wade, and at least 2 other trades
He had already previously received warnings on his posting and his trades.
A this stage it was a month but for getting mine and fields names wrong maybe it should be perma banned