I don't know how it is in other servers, a lot of gathering Bot(s) in Goblin will have a lvl 50 miner, and like most of you pointed out only one class upto 10 or 11, obviously so they can unlock and use other classes.
They use to just have basic lvl 1 gear, usually less than lvl 10 gear too at lvl 50. I've seen teleporting ones, under the map bot(s), bot(s) with tweaked super fast mining swings. I've reported, they disappeared; now they have more realistic names, they use sprint now before leaving a node, but still travel in a pattern (such as running towards an area then turning around, at the same point each cycle).
I too started seeing (I still call them "bots" you begin to recognize automated behaviors) with HQ gear, yet still a lvl 5 pickaxe. You can't tell me unless you're completely bored and have no job, that you can level miner to 50 and only play a DoW to 10?