If I accept cash in a Professional division (singles, doubles, team, etc), can I still compete as an Amateur due to my low player rating?

Yes and No. You may compete in amateur divisions at A, B, and C Tier events if your player rating falls within the guidelines: http://www.pdga.com/documents/divisions-ratings-points-factors However, you are now classified as a Professional with the PDGA and are ineligible to compete in Amateur Majors such as the US Amateur Disc Golf Championship and Am Worlds. *Please keep in mind that you may accept prizes in lieu of cash in a Professional division and remain an Amateur.