Don't know, I guess most people will reg a domain thinking they can do something with it or sell it for way more. When they can't they'll cash out at any price. Skinny
I reckon because they decide to invest into something else. If I have my eye on something on ebay or something, i'll sell my domains for less than I bought them for.
People frequently forget the cost of time. When they buy a lousy domain, instead of writing the purchase off, they attempt to sell it at some price so as to avoid a psychological perception of a financial loss. The reality, of course, is that they could have spent the 4 hours on making much more that the $7 reg fee. The same phenomenon has always existed in the offline market. Successful people are able to look beyond small losses (i.e. they view occasional poor decisions as inevitable and part of doing business), and focus on the big picture. But many of us tend to get fixated on small things. Think of the last time you may have spent an hour on the phone with the credit card company arguing over $1.60.
1) Cutting your losses 2) They thought it was a good idea last night after a beer and a bowl, and now they have come to their senses OR 3) They are worseless.
As mentioned: 1) idea / project that has fallen through 2) not worth what orig. thought 3) trying to make a quick couple of $$ back