If you can't afford to pay to have your helicopter serviced properly then sell it or earn more money.
There is a lot of paperwork associated with every piece of work that is carried out on a helicopter and it all has to be paid for. I spend many hours each evening doing paperwork and I'm not doing it for fun but to pay the bills just like everyone else.
The rates you have quoted seem to be on the low side already so you really have no cause for complaint.