I don't want to receive email for you via my paypal email address (not used to signup here).
If you want to receive payments using Paypal, then we need you to fill and confirm your paypal e-mail in your profile.
The confirmation step is required to protect our users from typos. For example, if you provide a wrong paypal e-mail (by mistake) and we let someone pay you, it is uncertain to me how paypal would proceed. So better to be safe than sorry.
The confirmation email is probably the only communication we make using your paypal email. Every other email will be sent to your primary email.
If you only intend to send payments via Paypal, there's no need to provide a paypal email in your profile at all.
See also: I don't have a Paypal account or a Bitcoin wallet, is that ok?
FreedomSponsors will charge a 3% fee on top of your payment. For offers in US$, Paypal's fees will also apply.