On sites that I have designed, I see on average where a PSP and Paypal are both offered, that Paypal is used around 20-25% of the time, the alternative PSP (usually PROTX, Worldpay or HSBC) does the rest. That is a statistic that is simply impossible to argue against IMO.
The public still generally dont know that you dont need an account and can pay using a credit card.
If there is no choice and it is clearly explained that you dont need a paypal account, people will pay using paypal.
If people want your product they will pay using whichever PSP is there. I think the supposed 'kudos' of a PSP may be illusory.
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