Hey Greg,
Either way it costs you, the store owner, to accept credit cards! You are buying their service to create and transfer the money from your customer's account to yours. There' no way around that percentage that I know of ...
You can either get a Merchant's Account through your local bank or a PayPal type account.
We have a merchant's account. We sent it up through our bank and had to purchase the terminal to process the cards ... about $500. Then there is a monthly fee that they charge, it's a percentage of the total charge including taxes and shipping. That fee can run anywhere from about 2.5% up to 5% depending on how long you have been with the merchant's account, how many chargebacks you have placed against you and your industry.
A service station will usually pay a smaller fee than a repair garage ... I guess because people have more fights over their bills with mechanics than with gas pumpers ?!? A chargeback is a dispute between the customer and the store often from stollen card numbers here on the net.
Where a merchant's account hurts the new business is in the monthly minimum rates. If you don't do so many dollars in sales they stick you with a surcharge. That can really be expessive. Way back when our merchant's account expected us to do at least $1500 each month or else .... AHHHH!
With a PayPal type of account you might be paying higher percentage rates .... BUT! ... as a new business or a new to credit card business you won't have that initial terminal fee or monthly minimum fees.
Plus if your customers are going to pay you using PayPal they have to have already been approved by PayPal. That does help in protecting you against false card charges.
Today, if I were starting out and selling finished carvings over the web I would probably start with a PayPal type set up. Then when the business was well proven move onto the merchant's account.
This is just my experience ... take what you and and trash the rest
Susan
OOOPS ... One more thought here. The net is about Instant Gratification. It has brought so many wonderful new and exciting things that we never knew existed within our reach. They see it, they want it and they want it NOW ... or at least i do

So that's why being able to take credit cards ... instant cash/instant payments ... is important.
Again, just my opinion.