I started caring about adjustments and improvements and being overtaken instead of focusing on enjoying the car and improving my driving in that car. Spent a fortune on my first car stripping it out, adding a cage, fibre glass, perspex, cams, carbs, taking it to a handling firm getting it corner weighted and modified roll bars put on, setting up the dampers, spring rates, upgrading brakes, playing with fuelling, ignition and timing, fitting an lsd, having wet and dry track day tires, changing gearing and so on. The car went well but it had to be trailered and it just got irritating.
Most fun I've had on track is a 182 FF on PS3's in the rain. Had a few rides in very serious stuff on those driving courses you get bought for birthdays and never thought I wish I was driving this.
I hark back to this days when roads were clearer and my parents hooned around in 80's hot hatches and I realised I kinda of like to recreate that and and you can only do that at a track these days so a tin can hatch on a track brings the most joy to me. Not what's scares me the most. I'd get another motorbike if that floated my boat. Nostalgia wins for me.