A lot of unrealized systems out there...

Just because someone has good feedback doesn't mean they're reasons for selling a piece of audio equipment are legit. If you don't list a reason why you are selling, that's the first thing someone will ask.

"I'm selling this preamp because it sounds like crap. I'm sure it will sound OK for you, though. The magazine gave it a good review."

"Just because someone has good feedback doesn't mean they're reasons for selling a piece of audio equipment are legit"

Not always, but it's a good indication. And for me, works more times than not.
I see you have no feedback here. I can tell you with certainty that keeping good feedback is not easy.
I've bought many phono cartridges advertised with less than 50 hours and a couple with around 10 hours. I couldn't tell the difference from new. Bought a Condrad Johnson PV4 advertised as NOS, and it looked it.
As for listing why someone is selling an item, I couldn't care less. If you told me you didn't like the way it sounded, so what. How do I know you are an experienced listener or that you room is set up right. Maybe you have the wrong associated equipment with it.

What difference does it make why someone is selling an item? There's a small range of answers and an unscrupulous person will lie about it anyway.

I for one am very much interested in why the device is being sold. I feel that the more information as possible up front the better. If the device failed and was repaired or demonstrated problems that the seller couldn't figure out helps me make a more informed decision. Yes some will lie, but that's on them. My obligation is to gather as much info as possible and do my due deligence. Most equipment has been demo'd despite what the seller is saying. Also make sure the seller has a receipt to ensure the device isn't stolen, which could explain the claim that the item is unopened. Be careful, ask plenty of questions and enjoy

You guys are taking my comments too seriously. Quite often people sell components because they don't like them for some reason. I just think that some would rather avoid telling buyers that because they may get less money. Of course, there will be a range as to how big the lie is. No doubt some will lie about condition and age, as well. That's a risk that comes with buying used gear.

"I see you have no feedback here. I can tell you with certainty that keeping good feedback is not easy."

Don't remind me. lol. I lost my whole account, feedback and all, when Audiogon made that big change in their format a while back. Luckily, I've been happy with my gear, so I haven't needed to sell or buy anything.