I can assure you it is not. It's about $0.001 per solved captcha with 97% accuracy rate and refunds on failed ones, from the service provider I know of.
I've even written one, it's not complicated and not expensive.
Yeah I was able to beat that "Robot check" checkbox by Google using some fuzzy bezier curves and random mouse movements/scrolling to simulate a real user's behavior.
Unfortunately Google has some other metrics to detect bots (such as no cookies showing they've seen you before, etc), so it wasn't 100% reliable.
I've even written one, it's not complicated and not expensive.