One could take it that some forestry companies (whether the private ones or the Scottish QUANGO) are doing stalkers a favour by leasing the ground out, and any fees charged are there to cover time spent on admin and potentially crop damage.
If you are among those being paid to shoot deer, you will either be expected to shoot every last one you see, at night and out of season (common for QUANGO contractors) or be an estate stalker who is expected to maintain a delicate balance between a sustainable population and age classes and grazing pressure/habitat damage.
Very few have the patience, skill, knowledge and self control to accomplish the latter, but it seems anyone with the right tickets (FAC, DSC2, etc.) thinks it's easy peasy to do the former...
Yet, most would be better off sticking to paid stalking...