3 or 4 years ago I tried Google Adwords to see if I could gain new customers. I admit I had a niche business, it was already successful, but I had read prior about certain tech companies overcharging - - or not cancelling services after you requested, so I opted to use only pre-paid credit cards bought at my local drug store. I chose $200 limit per card. That lasted for about 1.5 to 2 years, several times Google emailed me that my card expired or ran out of $$, and I needed to correct the error. That's when I bought another pre-paid card for a limit of $200 and funded my acct again. I never noticed any uptick in customers contacting me from my websites.

Eventually Google shut down the ability to use pre-paid credit cards (it came back an error when I attempted to enter the new card no) and that's when I closed my account. Their response was too obvious evidence <Goggle in conspiracy with the ad click bots> desired the ability to scam my account and one day I would check my email and get a $5,000 bill.

There is a rather obvious "conflict of interest" when you have to dispute a charge with your credit card provider knowing that the credit card co is fully aware they only make their "cut" if the charge goes through.