I, too, find both annoying...and here's why:
This is a Wanted/For Sale Section. You either put out there what you want, and are willing to spend for it, or you put out there what you have for sale, with a price listed.
The 'PM Offers' or 'PM for Price' is too much like a 'behind the scenes' blind auction...and this is not an auction site. if you would like to entertain offers, then pony up the eBay fees, or take it to Proficient's CueAuction site.
If you would like to know what a particular cue might bring...then ask just that...'What is My Cue Worth?'...and you will likely get some BS answers, but you will also get valid answers from those who have been here, and have that type of first hand knowledge. If it is a perceived highly collectible cue, that someone perhaps left to you....then PM the likes of JoeV @ classiccues, Sean @ cueaddicts, Marcus (FAST N LOOSE)...or any of the other few that know their 'stuff'. If it is a particular cuemaker..look to those here who specialize in that cuemaker's cues....TATE/Palmers, runscott and TATE/old Brunswicks, FAST N LOOSE/Tascarellas...the list goes on.
There is such a treasure trove of knowledge and resources here, that 'fishing' for a price is not really necessary. For those who are looking to buy...it works both ways...if you are not sure that a listed and/or quoted price is fair, ASK! Or...do a search, both here, and net-wide, and see what certain cues are bringing currently. It's called doing your homework.
Lastly...if someone DOES list a selling price, and you do not like it, keep it private or keep it to yourself!! Nothing can kill a For Sale thread quicker than a discussion of the seller's pricing. If you want them to list a price, then you need to be willing to accept that that is what they are asking, and either make a counter-offer privately, or move on. I have no doubt that part of this problem stems from this type of behavior in those threads where the price IS actually listed.
Lisa