Buying everything with credit cards to increase rewards and interest revenue.

I have been thinking lately about an idea to increase the rewards/cash back on my credit cards and I came up with an idea. Right now I purchase everything on my Visa Check Card and it works out great for me. I am able to check my balance at any time online so I don't even keep a check register. I normally know how much money I have in my account at any given time so I have never over drafted. Being the out-of-the-box-thinker I began trying to figure out if I can do anything different for my own benefit. I have a few credit cards that offer rewards like cash back or points towards items.

Heres my idea: My idea is to try to purchase everything on credit. Then pay off the credit card with my high yield saving account. Might seem like a crazy idea but maybe you need to think of it this way. 

• First of all if I am carrying a balance in my checking account I am loosing potential interest revenue. 
  
• By using a check card, purchases are take out instantly...if you are making interest on your checking account you are losing out as soon as you make that purchase.
• The credit card grace period can help to further build the interest in your savings account.

Here's a great example: Lets say you purchased something for $1000 with a check card. You don't gain any interest on that $1000 from the time you swipe that card. If you were to make that same purchase on a credit card and not pay for it until exactly 1 month later you would make $3.75 on the interest(4.5%) that you normally would have not made. Lets add in the use of a cash back rewards card that has 1% cash back on any purchase, thats $10 more  you just made. So you can save/make $13.75 on a single $1000 purchase. Thats $165 a year if you make $1000 in purchases every month. Chew on that. 

There are some disadvantages of this method though. First this method is for people who have zero credit card debt. Please don't add more debt to your problems this wont make it any better. You also need to be able to plan ahead because transfers can take some time to complete. This can be beneficial for people if they are willing to put in the small amount of extra time needed to pay of credit card bills every month. It is also important for the people using this method to be good with there money to avoid any potential issues.