gauging interest and FS...

[Aquattro]

I don't find it all that annoying, but if you're thinking about selling, it's because you're not using it and probably are pulling and scrubbing anyway.
And you don't need a lot of interest, if you post something for sale, you need only one buyer.
If you post something for sale, and get no response, maybe post with a question on why? Price too high, nobody wants to buy a one eyed fish with no tail, etc.
I don't see it as trying to get top dollar though, just maybe inquiring as to wether or not someone should bother even offering for sale an item that may not have a market. I know, not lots of work in doing that, but whatever.

[BMW Rider]

My take on the guaging interest theme is that possibly the person is thinking of upgrading a piece of equipment (or an entire system) but only if they can offset the cost by selling the current one. If they can locate a willing buyer that will pay a fair price, then they can make up the difference to purchase the new gear. Without a pending sale, the full cost may be too much. They may not want to or be able to part with the old item until they have the new one secured and in place.

Under these conditions, I don't find it unreasonable to ask. If your just trolling for the highest bidder, then be honest and post it as such.