It should be at least 1,000 clicks per 0.01 BTC or 0.00001 CPC. Right now I have 0.01 BTC in my Midas account. I thought that would be the minimum amount to buy some ads, but it seems i need 0.015 to purchase 50 clicks. It's not worth adding the extra 0.005 BTC to my Midas amount, because at Bitvisitor that can buy me 500 clicks. When you lower the price to a competitive level, I'll buy some ads right away. Thanks!