Yes I recognise having that option is an advantage, a major one for some cases (e.g. e-commerce). However I wouldn't be keen to put my credit card details in to a form on e.g. a blogger's website soliciting donations.

I think the problem is that Stripe is not a very well known brand yet (outside devs). So I can see your point where it's a global brand like PayPal or a well known bank/payment gateway in a country. But I'm not sure if you're nervous about putting your card details in that going to something called "Stripe" makes it seem much more trustworthy?

You could use http://gumroad.com then.

That may be true for you & me, but probably not relevant to the millions of PEBKAC internet users out there, who can't even tell IE from FF.

Actually this is a really interesting point...