Yeah I realize my GPAs haven't been ideal. I've been able to compensate for my grades through good work experience, and I would like to make myself stand out for a top PhD by doing good research under a professor or something and getting a strong letter of recommendation. I also hope that institutions will factor in the rigor of my course load at Princeton. I heavily took graduate, PhD level courses that were more rigorous than undergrad counterparts. I realize I'd have to retake these classes in a PhD program, and I'd hope they would give me the opportunity to improve given I've taken them once at least.
I haven't thought through the practical reasons all that much. I don't think it would make an improvement for me career wise to be honest, but getting a PhD is something I've thought about doing in my life for some time now.