Yeah, that sounds about right. Although, if this guy is working 2 jobs and STILL has time to go out in field service...what is their problem? As long as he is meeting the publisher required average to keep an elder at bay (I think in my congregation it was 10 hours a month) they should mind their own business.
However, it is easy for those that have "made sacrifices" to live under the JW rules to become a little bitter with those that may earn good money. I don't know if I would call this abuse, really. I would certainly call it rude, and stupid. I don't know if going to the circuit overseer would do anything but aggravate things for the brother involved. BUT if he was really bothered by it that much, sure, why not? I would just be careful though, because the circuit overseer and elders could turn it around, and tell the brother that he is not taking direction from the elders, and is putting material things before service to god...blah blah, blah blah.
The ultimate solution: leave the religion. (I know, you probably didn't want to hear that hahah). There is NOTHING wrong with working hard and making a lot of money as long as it is honest work. But the elders are the judges in the congregation...after all, they are the ones on the judicial committee are they not?
Anyway, that is my two cents.