I got a ticket for the Ibrox play off game because I had a season ticket (for the following season) I wouldn't have otherwise and many others lost out.
For me the real benefit is that I don't need to organise a ticket for the Celtic games etc as I already have one, I.e convenience. As a secondary thing it's a financial commitment I am happy to make to the club, although I probably miss 2 or 3 matches it's still good value for me.