Your #1, what I put up that poll for in OP, is really the only change/addition I guess I would say I'm "advocating" for. I don't want it to come across like this thread is my personal mission or anything like that- like I wrote in the OP, the main purpose was just to make sure these thoughts/concerns had a valid place to go without "poisoning" others FS threads. I think the concerns from those threads were valid, but I just didn't want to see said opinions shut down for being expressed in the "wrong place", or worse, a mod has to shut down someone's sales thread over it all. That's just a lose-lose for everyone.
The poll still has another 4 days on it. I originally set it up to end after a "workweek" of sorts. I figured that was more than enough time for even not-very-active users to log on, hopefully see the thread/poll, and get their $0.02 in. If other members are interested in disallowing interest check threads (I would add: with the exception of user-created/manufactured goods; our own admins here make these exact threads and they obviously serve a good purpose) then I would be in favor of adding that stipulation as well, though I think it's for the best to first let this poll ride out, solidify it, then move on from there, imo. I had planned to reach out to said head-honchos after the poll ends if reception to this kind of thread was positive, though I imagine at least /some/ of them have already been keeping tabs here to some small degree.
I think the majority of us (at least of those that have chimed in) are not in favor of adding any kind of post-count/status restrictions. We've had some shadiness, sure, but I'm not sure it's been "bad enough" to warrant any alcatraz lock-down garden walling for the time being...at least from my experiences/perspective.
I do admittedly like the idea of, at a bare minimum, requiring a short introduction post to access the marketplace, though admittedly I'm not certain as to whether or not the mods/admins are able to streamline that process via the forum software, or if asking for that would mean asking each and every new user that makes an introductory thread be manually approved. Imo, I feel like it's a larger ask when you're talking about putting more work on the mods' shoulders as opposed to instating a rule that we simply have to follow on the honor system without their intervention. A number of us, myself included, have brought up concerns regarding new users in the marketplace mostly ending in the sentiment of "we want to support -the community- first, so all we ask is at least try to stick around; see what we're about".
I think the vast majority of us are OK with new users dropping by on a whim and doing a little commerce, but having an introductory post as a small requirement would at least /somewhat/ be an attempt to push that "hey, at least TRY to make friends here first; we want you to!" mentality.
new users are always welcome to ask tech questions, post their setups, or make their own progress/restore threads. I wouldn't agree that making an account here means you should expect to get community-support-driven deals. Just like in your example: if that's the case and it's just the norm that everyone on AP lists their items at a 15% markdown, then every flipper on eBay and elsewhere would swarm AP because they're ~Guaranteed~ a deal 
it's a two way street. 
