I'm also back to r/c after a long break. Last week I had my first race since 1999, it was so much fun and I didn't finish last.

I also did some recreative karting during my break and you can not believe how expensive it is.
One day I was at a track here in Belgium with my kart. I set up my gear and a couple of new guys set up next to me. It's their first day so I help them get started. They bought secondhand gear so of course a lot stuff doesn't work or they don't have. During the day they must have spent over 500 euros each in the track's shop on tires and parts.
So sometime during the day it starts raining. The track has a huge party tent which is completely empty, so we move our stuff in there. Just three guys in a tent that can hold about 30 karts easy. Suddenly the track owner comes storming into the tent, demanding us to get out of there. Because the tent is FOR CUSTOMERS!!!! How's that for customer service? Welcome to karting boys! You've just spent a significant part of your paycheck with these people but apparently that doesn't qualify you as a customer.
You should have seen their faces! We put the owner in his place and he left us alone, but the whole thing was ridiculous. Kind of like watching the karting version of Fawlty Towers. I could never imagine this happening in this hobby. Last weekend I paid a 12 euro race fee and the people of the club were incredibly friendly all day.