Not sure...what is fair? Off-the-cuff to strangers, 45k...but for guildies, 50k. 75k to anyone in "that thread".
Seriously...for guildies, I'd like to put some thought into FMV. Trades will work, too, for stuff I can really use, like melee weapons. For trades, you'll have to spell it out, since I'll not know what a über-Joe-Bob's Staff of Whatever is.
Morgriff's is a Grenth's Footprint green. Price Check forum on Guild Wars Guru lists as 2k, but along with almost every Grenth's green, it has a "hard to sell" comment after the price.