I think that the initial feeling is one of pride and joy at being able to help Jehovah's organization. I did a lot of IT work for local brothers and sisters, and never charged a dime. Many of them actually offered payment, and some insisted on paying me. Even though what they offered was a small fraction compared to what I earned at my job, it did not worry me, as I was helping people who would also help us from time-to-time.
But yes, there were some brothers who found it very handy to have free tech support, and they wore me out after a while. When you know you have someone who will show up and work for free, suddenly you no longer try to fix things yourself, and you panic at every issue, no matter how minor. It's like having an auto-mechanic friend who will work on your car for free, and suddenly you need to report every noise or minor issue you think is happening, while also asking for monthly oil changes, and so on.