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As any experienced eBay seller will tell you, not all dollars are the same. A dollar paid by one method might actually cost you more (or be more risky) than a dollar by another method. And you definitely want to minimize your costs, especially when they're taken directly from what you're paid.
Fortunately, eBay doesn't force you to use any one payment method. For example, you can limit your payments to credit cards only; there's no law that says you have to accept cash or checks. So you can pick and choose which payment methods you'll accept—just as long as you specify this up front in your item listings.