I would check the credit card statement and make sure this didn't run as a cash advance before proceeding with more of them. We allow our customers to fund their new accounts with credit cards, but many don't realize it will show up as a cash advance.
I'm not sure I would have ever thought to check that. I just did though and a $6,000 payment I made in January showed up as "other services" on my credit card statement. I then checked my rewards summary for that month and I was given $120 for the charge.
On a side note, I recently started billing my business liability, workers comp and auto insurance to my credit card as well. The insurance company doesn't mind and this will literally pay me close to $300 just this year. Sweet!
I'd really like to find other avenues I can use to profit from these rewards points.