Man, I'm still waitin' for my first GF to start renting. I see them as a great opportunity for funding rentals as a new player until I own enough cards to form my own teams.
I love the cost/value breakdowns you've provided, and I definitely agree that GF's have been implemented in a way that can add value when approached with the right mindset.
!1UP
P.S. - Welcome to Hive! Also, I suggest taking a moment to look up how to properly source images so you don't ruffle any feathers. Even if you're using entirely opensource work, it'll help establish your legitimacy as a poster :)
Have fun out there!
RE: Gold vs Regular cards - Is Gold worth it?