12 dollars for that Boston record? I understand it costs money to stay in business, but that record is too common to be moving anywhere at that price considering it's even in gently used condition. What you need to be doing is marking up old jazz records i.e. that $5 mingus.
Have to be so careful with sealed rare vinyl as a lot of it is faked and sometimes the only way to know is if you play it as the sound is normally bad. I have some sealed things from before they faked the stuff and selling it is hard because of this
You're going through this like a customer rooting through albums to see what's in. We want you to go through this like a guy showing us what's in. Slow it down a bit.