I know people who actively add and remove a bin price (varying amounts) because it fires a change email to watchers and previous interested parties. If your bin's are reasonable this tactic I'm assured does work, and on a bin you pay less commission (so I'm told). I don't really use Sedo, closed my pro account, and now just have a standard one which mostly gathers dust, so I can't give a first hand opinion.
In the last 30 days, I would estimate a total of 2 dozen, of those around 20% were crazy low balls (£100 for bomb.co.uk/.uk for example), about 25% were via phone, 45% via email. The remaining 15% was social media.
The phone calls and social media have only occurred since I added those details to my website. It is a decided increase in enquires from adding these details.
The low balls have ALL come from landing pages, so potentially bots.
I haven't asked people how they came to find me, but most of those which materialised into a sale have implied, it was from the whois details with my URL by my tag.