Warlock summoning bots

I've used these Warlock summoners before, and I always pay the amount required for the summon, but I'm curious does anyone underpay them? Does anyone try talking to them to make sure they are actually playing and not an actual bot? How profitable are these things, there always seems to be only 1-2 summoners for most locations spamming in the services world channel, but obviously this person has to have 3 accounts and I guess they gotta have at least 2 level 20 locks so they can summon the swap out and reload soul shards?