| Unless you trust the seller, screenshots which can obviously be easily manipulated (not that stats can't) are not to be taken seriously, not without doing more research of your own first. I guess such reported stats can be a good selling point and attention grabber that makes you consider certain domains more seriously, but if the sole reason for somebody buying a certain domain is traffic, then I guess one should know better...
I'd say use common sense, but unfortunately common sense cannot be applied 100% of the time. There are exceptions, which can for no apparent reason (at least to most of us) generate more traffic than is to be expected, however most of the time if it looks like a rat, smells like a rat and sounds like a rat, it probably is a rat. And I'm not talking just about domains either...
Sellers often fall under that category as well. |