Short Version:

Missed Slippery...
Heard Runaway for the first time in (probably) 1987 -> Loved it.
88 or 89 a friend recorded Jersey for me -> Loved it even more.
For Christmas I got Blaze from relatives -> Loved it.
If my memory serves me right I bought the whole catalogue after that.
So I listened to it on a regular basis but wouldn't consider myself a diehard fan.
Not until the friend who recorded Jersey for me bought tickets for himself and his girlfriend for a KTF concert. (I owned KTF already but was not really interested in concerts back then... stupid.. huh?) Anyway. The girlfriend couldn't go and the friend gave the ticket to me. I went instead of his girlfriend and ever since I'm addicted.
It still pisses me off that I didn't go see them live in the 80s. Stupid me...