It's like hoarding in general, you never need it until you get rid off it. When I started buying slalom boards I sold quite a few of my pointer power box fins and converted a few to tuttle. I'm think I'm down to about a dozen now.
But of course now I need a power box blade now to do some speed testing on my JP FSW. So from now on, lesson learnt, I'll just keep hoarding.

Snides8, is that a nice collection of Tectonics fins, top middle? very nice!