Before raising the alarm bells, here is what you should have done.
You can test your theory, sort of : Run 1 week with CCBill --> Cascade --> Epoch, then just CCBill. Make a simple charge compariing your traffic patterns to your sales. Switch back to nornal for 1 week, then switch again. You need alot more than 24 hour's worth of data to get anything close to a clear picture and even then you would still be guessing.
Here's how to solve your problem. Install NATS and plug-in as many different billers as you can. Compare the sales and declines of each biller for a period of 6 months, but be sure to deduct all of the CHARGEBACKS from each biller so that you are only counting the true sales. If each biller provides roughly the same amount of sales, drop the ones which charge the most and keep the ones with the lowest pre-transaction rate.
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