Selection of server whether shared or dedicated depends upon the various factors like intended web traffic, size of the website, expected growth and the content. In dedicated servers, it serves one client at one time. Dedicated hosting manages physical server and also offers many other services like upgradation, maintenance, system administration and installation of software. Such type of managed servers are preferred more as the host can offer immediate emergency service if the server crashes down.
Websites that are smaller and have average amount of web traffic to their credit may go for the shared server. Cost wise also it is cheaper in comparison to dedicated server, but the amount of disk space, data transfer, speed and bandwidth is restricted or limited. A single shared server hosts multiple websites with different businesses types.
I wouldn't call it SPAM! in a broader sense its a way to get more exposure for your website, you post it under "Web development and designing" forum, take up valuable space from users who really needs tech support, put on information easily available in Google just to put and advertisement for your website that too in the signature so that the admins don't remove it. He / She worked hard dude and you got the nerves colinsp to call this SPAM, how could you?
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