In Ryanair, anyone opting for Line Training Captain /TRE etc certainly paid own transport to training location, & own hotel. I imagine that the "cost" of upgrade to Capt (thinking particularly Sim ) is probably borne by the Candidate. I joined as a Capt so don't know 1st hand, but would be shocked if the "promotion" bore any cost to the company.
Regretably, I think that the day you dread to speak of has already arrived, & the cream on the cake is that a "new" Capt in FR, will in fact earn no more than he had as an FO on an "old Brookfield Contract", he has merely purchased a more effective "get out of jail card".