I've seen the same post on the services section, your on the board of service discussion and I believe this isn't the right place to offer that. By means of correcting, you can move this on services.
I will be grateful if you donate merit 
No, merit's are only for quality posts not with service.Good that you establish that fact and for Op to know that your service to the community does not earn you sMerit if you don't have some quality posts to back it up and this you doing could be interpreted to mean merit farming the same way people farm for trust when they offer acceleration services sometimes ago.
Do your thing, help others and don't ask for trust or merit in return. Its even better if you will announce that you want to be paid some amount for it if you know you cannot afford to do it for free. With that, you don't feel guilty of someone not dropping a trust for you neither you get someone else open a thread on meta section against you. My opinion.
Very well said. 