Sure. I guess bitcointalk is using some kind of double IP detection system. So, this user also needs to use different IPs for different accounts. This is really a stressful job.
That depends if you participate in a signature campaign and you end up making 1500 posts per month you could potentially win more than a regular job but im pretty sure you would get banned for shitty posts because lets be honest, that much amount of posts is impossible to be constructive