I have about 100 of these - and I've been selling for $50 - $380, though sales have slowed in general.
However I notice buyers have contacted me to purchase as choices for short domains are rare - I've sold domains with "Tow", "Vet", "Car", "One", "Fat" and a few more - that as far as I know for most - correspond with a business' tel or toll free numbers's last four digits (like 416-872-2VET) I think some may have rebranded their online presence to the aquired domains. I know there's value for these for end-users, even if domainers are stuck on some awful LLLL.com's that are not nearly as brandable.
I am going to develop a few to some extent and sell them differently than rest. Thinking of doing:
2CDN.com (canadian portal "too canadian, eh")
TKO0.com (boxing)
0GUT.com (weight loss - would match with perfect num such as: 1-800-555-0GUT)
4KIN.com (ie: search.4kin.com)
ROW0.com (ticket sales/info - "Row zero...get closer than 1st row"
INN0.com (cheap hotel info)
6TWO.com - still thinking about this one
these are ones would be harder to sell unless I can show how I can be used - then people realize how a short brandable domain like these would be so beneficial.
Think about it, for a tow truck company...having something like TOW3.com and 1-888-303-TOW3 written on their truck is much more memorable than perhaps the company name; AbramsTowingServices.com 416-533-5319
I am going to raise my prices for these, regardless of the domainer market - as I see the end-user market is eager to purchase these domains as long as they fall under $1000, so my base price will now be $80 for least desirable
BTW - if you have HOT1.com I would appraise at price of don't sell under $12,000