If you use Attend JEvents together with JomSocial or Community Builder you can add custom profile fields to your user record so that an event creator can record their paypal email address.
Then when you create a registration session in Attend JEvents it will use this email address instead of the global paypal email address.
The profile fields are as follows:
JomSocial : Field code must be FIELD_PAYPAL
Community Builder : Field name must be cb_paypaladdress
In addition you can change the paypal when you create a registration session and specify a payment method.
NOTE: This feature is also now in RSVP Pro from V 1.4.6 onwards.