HI,
Just my two cents/pence worth. From what I've gathered from other, vastly more experienced members than me, is that E-Bay's own counter is little more than a random number generator and should not be relied on for an accurate view of hits to your listing.
I prefer Sellathon because it is part of the Auctiva package which I'm a little fanboy of.
There is also Andale for a free counter if you really don't like the Sellathon or E-Bay one.
Regards,
K.