Credit cards actually charge fees to the merchants, and the cost is passed to the customer. In theory, if you paid with Bitcoin, it should be cheaper by more than a few cents.
With Bitcoin, you aren't owing money to someone. You either have the money at the time of purchase or you don't. Sure that may be inconvenient, but so is having to pay credit card payments and if you are late, then also the huge amount of interest that will generate.
Another thing about Bitcoin is that you don't need to give away all of your personal info in order to get some. Unlike with credit cards, there is no application you have to do, and you don't need to wait for any application to be approved before getting Bitcoin to spend.
Another is that if your card gets stolen, it is a pain in the ass to recover from fraud and it is also incredibly difficult to recover from identity theft that can also occur with stolen credit cards. With Bitcoin, there is none of that hassle, just the risk that if your Bitcoin is stolen due to your own poor security, you probably aren't getting any of it back.
Bitcoins is getting more popular now and the reason is that it becomes more acceptable so there will be more people that will get to know about Bitcoin and that is quite nice.
And you also see now that you also can buy more stuff with Bitcoin and that is nice for the currency itself.
