Ask HN: Any experience with, or advice for, selling a site on Flippa?

Greetings. I'm curious if anyone here has had success with auction sites like Flippa (formerly Sitepoint Marketplace). I've just posted my first auction (it's a 3.5 year old retail site), and I'm wondering if there are any tips and tricks that I might be missing.

I'm currently contacting competitors and vendors to alert them to the auction. There was an "Ask HN" posted a couple months ago similar to this one, but I'm hoping for more specific advice or ideas. Thanks very much.