Don't many users already have PayPal accounts, though? I'd happily spend twice the development time if it meant users were less likely to leave the checkout page because they already had an account and wouldn't have to type as much.
A little more dev work upfront can improve your conversion rates from then on, basically. Heck, I pay with PayPal instead of direct debit/credit cards when both are offered just because typing the PayPal password is easier than filling out all the card and address info.
A little more dev work upfront can improve your conversion rates from then on, basically. Heck, I pay with PayPal instead of direct debit/credit cards when both are offered just because typing the PayPal password is easier than filling out all the card and address info.