I use AdHitz to get some referrals. I spent 10$ so far and got 7 referrals, and... only 1 clicked 10 ads. The rest did not even clicked one. Now all seems to be inactive so I consider paying for getting referrals pretty useless.
Just waiting until my campaign will be over and I do not think I will pay for this kind of ads any more. This is a waste of money.
A little update 2013-11-03:
Statistics generated with Adhitz campaign (last 30 days):
Unique aff link clicks: 632
Total: 776
Referrals: 8
Active (clicking) referrals: 0
Money spent so far: 14,76$
Banner views: 412059
Do not tell me it is good way to get referrals