PayPal’s merchant services business has grown by over 40 percent year over year

The reason Paypal is growing so fast is their rates are extremely competitive if you play by their game. I really feel for the guys like Braintree who are trying to do it right but just can't compete with Paypal's rates, particularly with Paypal offering the same qual and non-qual rates.

I've used Paypal Merchant Services for several years and each year grow more fed up with the practices. Just a few include charging .5% extra if you do not include Paypal Express button in your checkout, keeping the 30-cent transaction fee on refunds, increasing the chargeback fee from $10 to $20, and not letting you export subscription cc info if you want to move your subscriptions to another provider.