I can only confirm that!
Since I am in the signature campaign at Freebitco.in (now also already in the 19 week and I hope the campaign continues for a long time) I have also generated some refs through my signature...

However, where all the clicks on my link come from (in only 30days), remains a mystery to me!

I think this will be a long term signature that's why even there's some more higher pay rates campaign I tend to stick with freebitco.in. I think that's still fine you may not know that 1 user may deposit huge balance or may win a huge jackpot you'd be earning too. That's too many clicks but only one signs up and seeing your profile