What's the difference, anyway...Paying for a TR doesn't neccessarily mean you're loosing out on the big bucks. The beancounters are only after to limit their costs..if they pay your TR and you leave after two months, they loose money. Simple as that. On the other hand, if you pay for your own TR, they can pay you full salary right from the beginning.
I'm abit puzzled by the fact that young guys willing to pay in excess of 60000 Pounds for a fATPL think it stops there. A fATPL will get you no where near a jet cockpit. Period. Paying your own TR can bring you an interview, and if you're lucky, you'll start linetraining with a possibility to join as an SFO if you pass. What more can you ask for. Seriously.
My point, paying for a TR can make your biggest dream come true.