I use Ambrosia and such to buy stuff at Stamps and Magic at inhuman speeds.
This is an old post, but idc. Was that typo on purpose? 
Apparently everything is HTS these days. When the only people re-sellers have to sell to are.. other re-sellers, estimated prices become
. For me if an item is 400k or above I just consider the first offer of half price or above a super instant accept. Even getting people to buy MPs for half the going price takes way too long sometimes.
It does seem like everything is considered "HTS" now. I don't even get annoyed dealing with resellers though. If its a decent profit, I'll take it. I'm not one to complain, and I try not to be greedy. If they wanna deal with the hassle of selling near full price, I let em.
Maybe I'd be more rich if I didn't think that way, but I couldn't care less. 
If its a higher end item, I do try to trade for an item I need in my gallery instead of going for pure. Its a win-win IMO. haha