While it might seem like a good idea to stick a link to your web hosting company in your signature line, everyone else on that same hosting forum is thinking the same thing too. So after awhile, it becomes a big 'me too!' circus and no one wins. A better solution is to find forums that offer compatible but not competing niches such as webmaster, SEO, business marketing, online learning, etc. These sites are not specifically devoted to web hosting and won't attract as many who are resellers or web hosting company owners. So, if you choose to advertise via the signature line on one of these sites, there will be less competition for that service.