I really love seeing people put use to either expensive or cool old cars, especially the old stuff - a car that's 30+ years old and still serving a practical purpose is pretty damn cool in my eyes.
That said, if you're going to evaluate what you should own by how much use it gets; then I should probably sell all but two of our fleet. It's not that I don't want to, I'd love to spend all my time driving and enjoying my toy cars, but that's just not feasible. With work, writing, the house, project cars and making time to spend with the wife it's extremely tough to find time to do anything with the toys. Sonoma and SLK probably have logged 500-700kms each this season. The Camaro and MGB haven't been touched since this time last year, and all I will do before the fall is run them around the block a few times.
Access to the toys is the biggest deterrent for me...At minimum driving one requires moving other cars around in the driveway and/or operating the lift in the garage and/or going to my grandmothers place....It's all just wasted time. I hope that someday I can have a proper setup (like a nice big Quonset hut) to keep them all with easy access. Then I imagine they'd get more use.