I am with SAS, and we happily accept industry colleagues on jumpseat provided they have a ticket.
Well thats the point, you give a jumpseat to a colleague in case there is no other seat available and he has a ticket,
but the thing about jumpseating is, that you don't need a ticket and that only works in the southern countries of Europe.
In my last company I paid around 100€ for a return flight to get home, quite something for a stby ticket.
I don't think that it would ever be possible in Europe, as many people are already jealous that we get "cheap tickets" while making these hough salaries.
They would go mad if we could go home for free.