One thing to bear in mind, Kuthad, is that the 'APD Ranks and Promotions' guide detail Constables as "still in training". It's only when a player becomes Corporal that they are a fully fledged APD Officer. I was cadet for 4 months, mainly because my play time was irregular due to working commitments. My work commitments died down and I started playing regular again and I got Constable.
Cadet or Captain, we're all part of the APD, and I'd like to think we're all part of the APD for the love of the APD RP. It's not about how much money you can get from bounties, or what power you have over other people due to your rank, it's about putting yourself in the shoes of your character and becoming your character. You can get satisfaction from that whatever your title is.