I only 'sell' the first three spots on my GB's and do the rest with trades, it just works out better for me and my schedule. I snipe my Hood often so they are always trying to "retaliate". If I were to prime my GB for all 5 spots, I'd have a decent chance at getting sniped. I could prime, sell, prime again, sell again til I was done, but that's a lot of work just to save a few lil fp's. It also keeps the trade threads moving for the smaller, or the more casual, players, in my Guild. Helping the Guild is more important than the small amount of fp's I might lose.
One of my gripes about the ARC is the sense of entitlement it has given newer players cause the lil shits don't have to work like a lot of us did back when everyone and their brother weren't offering to give 1.9 on everything. We were happy just to get 1st and 2nd locked for free while the donating player made a few fp's.
P.S. I can't tell you how many people I've sniped that have sent me a message asking for the rest cause I didn't put 1.9. Many belly laughs there. Many.