There could be any number of scenarios..
I had a gallery with link at top & link at bottom..The gallery was getting 4 to 5 k a day & the clicks were very low & it was promoting a join4free site..
Was too late, but turned out that the bottom link was getting more clicks than the top & the bottom link was missing my referal code..
Also, it could be the sponsor..maybe the surfers dont wanna visit..
It could also be the type of traffic..
Freeloading surfers wont click ads..
Or niche specific surfers alot of times dont explore out of niche..
Maybe the stats are inaccurate?
I got 50k+ on the first day of a hun listing & only netted 1800+ clicks & 1 signup on a lightspeed site...
That's because of the type of traffic..
Hun surfers know they will get more pics 4 free staying at the hun..