In offroad it's not always so bad in the wet!
The cars tend to be better sealed up between the chassis (or undertray) and the shell, so blutac'ing or Lazy Goo'ing the electrics is a reasonable safety measure as the insides of the car sty pretty much dry anyway to be honest.
If your track is astro, then the grip levels do reduce, and in some cases dramatically, but there are tyres that cope to a degree as long as there isn't any standing water...and it can still be driveable and fun...so stopping a meeting is less likely.
In onroad I guess you need to go to greater lengths to keep water out? I've never done it so I don't know...and water on tarmac is just not a fun place to race I would guess...although I suppose you must have wet tyres too.
I know a championship series it's more vital to get out there and run anyway...especially when people have traveled a long way, but for local club meets, I guess each person can only make a judgement on how much they want to risk a car and how much maintenance they want to do for a club meeting...and whether staying at home in the warm and dry is actually more fun.
I guess it's just the joy of racing in the uk!
