Racing is expensive.
Racing can be expensive, but it doesn’t have to be. It certainly gets expensive if you convince yourself that you need that quickshifter, auto-blipper, carbon fiber wheels, motor work, etc. However, you’d be surprised what even a stock bike would do. Make sure your suspension is setup well for your weight, and throw on some good tires. It’s not any different than what you would do for a track day. The extra money that you save and put towards race fees will make you a better rider than that titanium exhaust system that you were going to buy.