Already sold (2) Two and was a go between for 3 license transactions. It easy to get burn with paypal transactions or any form actually. If you sell your vB Lic#, then you can get hit with a charge-back day(s)/week(s)/month(s) or even up to two years later (This is so rare and most likely will not happen).
I ask buyer to use Western Union, then I transfer Lic.# to new customer (vB sales did the transfer... I just requested this).
*Lifetime: Product Shelve Life and not meant as for use and or support.