Yes.
I arrived at the decision to sell my cars on the following:
1. Traffic around here has taken away the joy of driving anything sporty. It took one hour to commute home every day, an average speed of 25mph. Having something with 300-500hp - and paying insurance on it - starts feeling a little silly. Driving down the coast is nice - except that you're averaging about 10mph. Driving from Orange County to home - a one-hr drive in no traffic, is not fun when it takes three hours - in a manual transmission car. Devotees of manual transmissions in urban areas, I bid you well.
2. With the cars I built from scratch, I painted myself into a corner, putting so much time and money into them that I became anxious about damaging them - potentially having to spend $$$$ to fix the drivetrain. This made driving on-track much less enjoyable, worrying more about damage and cost than going fast.
3. Autocross: I participated for about eight years, really getting into it for a while, pleased to see what my lowly Datsun 1200 could beat. Then, what was an awesomely huge parking lot started changing. They disallowed dispensing lime to mark the course, but I adjusted, knowing that it affected all drivers equally. More concerning was that the lot started shrinking, starting with the installation of the Metro trolley line that ate up maybe 25% of the lot, causing the courses to get smaller. Back then, running costs weren't an issue - the Datsun was small and light, so consumables lasted a long time. The entry fees were around $20-30 if I recall, so finances were a non-issue. Standing in the hot sun (San Diego) all day started sucking the fun out of it. Though others may argue; three minutes of track time for an all-day outing is a negative influence. Then I discovered trackday events and my interest dropped to zero. That parking lot is now gone, and the next closest autox events are much further away, making a long day even longer. Don't miss it.
4. Trackdays: Enjoyed these a lot, but then they changed as well. Back when I got started, everyone worked on their own cars, they often had Bondo and primer on them, and we didn't care. People walked through the pits, talking to everyone else and comparing notes. But as the car market changed, so did trackday attendees. Starting about 15 years ago, people started being able to buy cars that had really good performance right out of the box. What ended up happening was a pit full of nearly-new very capable cars. Being new and fast meant hardly anyone worked on them, so no reason to talk to anyone. The pit experience changed to everyone keeping to themselves, or only talking to people with the same car. The sense of comradery was gone. Obviously, just my opinion.
5. Related to #4: I realized that technology had moved to a point where I, one guy in a garage with a hobby budget, could no longer build something that could beat cars costing ten times as much, driven by people who didn't have the same level of mechanical sympathy that I did, had much deeper pockets in case something went wrong, and had all sorts of nanny electronics to babysit them if they got in over their heads.
Conclusion: so, yeah, I've given it up, turning my love of making stuff to building tools for my shop - the latest being a 1,000-lb CNC router. We now drive a virtually invisible compact SUV and every time I see an expensive sports car stuck in traffic, I wonder how much he's enjoying himself, frustrated at not being able to open it up, and having anxiety over door dings, fender benders, and when will his warrantee end.