I wouldn't want the company to rethink their offer if I renegotiated. I looked at Glassdoor reviews and it said that the company is more than willing to match other company's offers. I verbally said yes to the job but another offer came in with 20k more. Is it not worth it in this case? I regret saying yes too quickly and was wondering how bad it is for me to go back and change my mind.
IMO, very bad. Stick with what you agreed to. It was perfectly fine when you agreed to it, right? Chalk it up to experience.