I pay a set amount, and anything that I shoot comes home with me... Up to me when I stalk, so if I go out once in the year and don't get anything it's been a bl**dy expensive year, but if I shoot 5 deer over the year, then it's pretty good value.
All that said, for me it's not so much the cost, or even the return on that cost, it's about having land that I can stalk on pretty much when I want to. I get to know the land, when and where the deer tend to appear. I know back stops, crop cycles, wind directions and where the sun rises/sets. All this adds up and means that I get onto the land before dawn with some semblance of a plan rather than only being able to stalk in an afternoon so that I can physically see everything to make snap judgements.
Do your research on any syndicate and you'll find those that others have been bitten by! There's one in Yorkshire that regularly gets mentioned on here, so ask the right questions and you'll get the feedback you need.