not sure how statistically sound this survey is?

I'm "surprised"; I don't know anyone who prefers Paypal to a card.  Personally I gave up on Paypal a few years back:

1. I was fed up with having to prevent the accoutn go 'dormant'
2. I was fed up with all the phishing attacks (if I no longer use Paypal, this is no longer a problem, I just delete the message rather than examining the e-mail address/headers, quality of the English, the hyperlink, ...).
3. I'd read a few horror stories about Paypal freezing accounts.  Paypal is not a bank.  There is no recourse.

As a merchant, I'm not a great fan of PayPal. However, this survey refers to consumers. Based on my personal experience of using PayPal as a consumer to make payments, let me put some facts straight as I see them: 

1. In close to 10 years of using PayPal as a consumer, I've never ever seen my account go dormant despite long periods of non-usage to make payments.  
2. Most horror stories are of PayPal merchant - not consumer - accounts getting frozen.  
3. While merchants get Seller Protection only on rare occasion, consumers almost always get Buyer Protection when they pay with PayPal. As a matter of fact, PayPal uses the latter point to justify why it needs to inspect sales transactions frequently, which is often an euphemism for freezing merchant accounts.