Selling players for FAAB money?

[Calculated]

I'm the commissioner of my 12 team league. Last year was our first year as a group of friends playing fantasy football; we had standard scoring and waivers based off a continual rotating list because those were the default settings. I didn't want to mess with the settings, especially since we were mostly all novices. This year we switched over to 0.5 PPR and FAAB. I like the idea of FAAB waivers a lot better because it gives everyone an equal opportunity at waivers. During our draft last night one manager drafted a player that someone else was really hoping would fall to them a few picks later. The manager says he'd sell her the player for FAAB money. That's the first time I've heard anything about exchanging FAAB money and my first thought was that it didn't seem appropriate. What are your thoughts? At first I was completely against. I do think that adding a little FAAB money on top of a trade that actually consists of players being exchanged could be good to even things out as much as possible. However, I still don't think that selling players is something I can get behind.

[Montana is da Man]

I've done it before.  It's trading a player for $$.  I don't see it as a big deal.