I'm still new to the GSA game, but I identified two major problems:
1. Captcha costs are piling up big time. I use 2captcha and textcaptchasolver (mandatory, I think, for forums).
While proxies I can scrape for free and get so/so results and I also have private proxies, the captchas are still a problem.
I am thinking of buying CB but I wonder how much do you guys save with CB and a second captca solving service, instead of using only services like 2captcha, deathbycaptcha etc.