The trick is not to ask for money. @Joe and i always give the keys to a prowler and say "Fill it with donuts/coffee/Spikestrip and the constable lives" and if they meet our demands the officer always 100% lives. Ive never had a problem with the negotiations or even being gunned down. But ill be honest if you ask for money IE 100k You will never ever get it. 1. A constable with an MX is worth about 3500$ in equipment. And so it may be harsh but that's what their worth. Cadets have free load outs so their worthless. its not until you capture a cpl or SGT that you can make demands of 10k, Keep it within those boundaries and 99% of the time your going to get your demands and have a fun experience.
((imagine stealing a hatchback sport and demanding 100k for its safe return))