You don't.

You can offer Paymate or get your own credit card facility. Neither of which normally cost less than Paypal.

I wouldn't call 30c + 2.4% that expensive. Works out at about 10% all up for the items I sell. About the same as eBay fees.

You have to work out your costs vs benefits. If you don't offer Paypal there is a good chance your sales will be significantly less. So, lower per item profit vs no profit from any of the sales you don't make.