I had bought quite a few Captchas from DBC and I did not use them fast enough so they took them away from me. Be careful as they now told me that in their terms of service if you don't use all you captchas in 270 days they will take them from you. I slowed down using them because they started to be not very acurate and I was giving them a chance to catch up with themselves but instead they just took all my credit. The money doesn't bother me. What bothers me as they give you no warning as they just take them. Who in the hell reads the terms of service on any website? So if you use them my advice would be to buy small increments and know that you will use them up fast.