Since I've never purchased (or sold) an existing domain, my input is less than what someone else might provide. However, when it comes to buying a domain I would look at the sales/conversion rate as the primary factor. Not what Alexa says, not what the green bar says.
As grandpa says, conversion rate is a factor, but that is more akin to the sale of a business than the sale of a domain name. In which case you want to look at profits and not so much at conversions.
There are a few threads on here discussing the possibility that google are looking at Whois records and discounting PR on sale/change of ownership anyway. I have no direct experience of that, but worth looking into before you buy.
TJ
I am shopping around and just want to know what to look for and what to avoid. Are there any factors that do affect that value of a domain either positive or negative that one should be a wear of?
Thanks for your feedback. It most appreciated.
Definitely scrutinize the backlinks of the domain very carefully - it wouldn't be the first time that the seller of a domain used his/her own link network to plump up the PR before putting it on the market - as soon as the sale goes through, the links get pulled.
If I bought 4-widgets.com could I get in trouble by 4widgets.com for infringing on them?
For example: webmasterworld.com and webmaster-world.com or prepay.com vs pre-pay.com (both hypothetical of course)
Thanks so much.