Per Stripe's original announcement[0] in 2014 – the net profits from any sale go back to the Stellar Foundation:
>> When the opportunity arose to help Stellar, we enthusiastically agreed. A couple of months ago, Stripe contributed $3M to help get the project going. In return, we received 2% of the stellars. However, the project is not run by Stripe. We just believe that a system with properties like Stellar's should exist in the world, and we heartily encourage anyone interested to participate in its development. We're going to auction a majority of our stellars to other interested companies, with any net profits being returned to the Stellar Foundation