I would never purchase an "as is" item without a "satisfaction guaranteed or money back" statement if the seller did not list in depth the defects.
I guess we're using completely different language here. In every instance I've seen - retail, eBay, or otherwise - "as is" means precisely "no returns". "Satisfaction guaranteed" is the opposite of that. However, as you say, you can always walk away from purchase if you don't like the terms. That was all I was saying.
If you are selling a pipe that is in less than seller condition, state so.
I've never sold pipes on eBay - never sold pipes period, actually. I've also never intentionally withheld any information about defects on any item I've sold. However, some items take more time to precisely describe than that time is worth. For example, I've sold quite a few Lego sets on eBay recently. For a rare, high-end, collectible set, I'd inventory every single piece so that I could guarantee it's complete, and take exhaustive photos. For a set that might sell for $50, it's not worth the time. I'll list it as-is and accept that it will only sell for $40. The extra $10 isn't worth the hour of my time.
Perhaps you feel I have an obligation to spend that time if I am to sell the item at all. If so, I disagree.
"as is" has a very defined meaning in the retail industry.
eBay is not the retail industry. eBay sellers are not necessarily professional retailers.
If moving inventory is the over-riding consideration when listing an item you are certainly not catering to your customer base or trying very hard to grow one.
I'm just a guy who occasionally sells extra stuff from around my house to clear space, make a few bucks, or switch up between hobbies, as are lots of other folks on eBay, Craigslist, etc. I don't care about growing a customer base. If you want to walk away from one of my as-is listings because I'm not offering an ironclad guarantee, I'm completely fine with that. That being said, I've sold about $10000 worth of stuff on eBay over the years and never had a complaint or dispute. My buyers have always been happy with what they've gotten for the price, and I've been happy with the proceeds.