I've read from more than one source before launching a product (especially the first) and using Paypal to process the payments, that its a good idea to contact Paypal to alert them. It is supposed to help prevent having your Paypal account suspended while they investigate and make sure the charges are legit.
Well, I did just that and the Paypal representative told me that it wasn't necessary. He stated that if Paypal security had any problems, I could be sure they'd be contacting me.
Maybe some forum members with relevant experience can shed some light on this subject. Is it, or is it not helpful?