For me JOG, it's about learning and knowing I've tuned the carb as good as possible for my setup. It's also fun to do all the WOT pulls.
I installed the PWK38 carb because I literally broke the stock carb. I added a UNI filter to accomodate it and get it breathing better. I installed a Dyna muffler because I like the look, sound, and mildly better breathing. Just all the low hanging fruit stuff. I've only spent about $150 on performance enhancements.
I'm not going for 50hp with an aggressive cam, bigger valves. porting, and big bore high comp piston. I have thought about it, but I've decided against it. I may try to do a little exhaust porting that really won't cost me anything except time. Better than arguing about politics all day at the Tall Table.