I agree with you on the value of honey as a consumer, although I'm guessing we're not the main targets for this kind of plugin. But, I think you have to look at

I agree with you on the value of honey as a consumer, although I'm guessing we're not the main targets for this kind of plugin. But, I think you have to look at it from the perspective of PayPal's core business: payment services. My guess is that paypal wants honey because honey lives in the checkout of every website when the plugin is installed. PayPal can increase their own revenue by offering incentives for people to checkout with PayPal (instead of another payment service). Maybe someday they could even offer payment services on sites that don't even accept paypal, at least more easily integrate with those sites for Honey users. They could also sell extended warranties, or resell 3rd party ones as many retailers now do.