My signature...

[laptop-tech]

...

[MrDisco]

I understood that it was against the rules (thou I dont see why it would).

lol isn't that slightly oxymoronic? it's against the rules because you're advertising your services:

"No SPAM/Advertising. This includes promoting a company or service in your signature or sending unsolicited messages through the Private Messaging system. If you wish to promote your company, please contact biz@redflagdeals.com."

As for why other people have it, just report them and the mods will take care of it. I have to agree with them and say it's unrealistic that they will be able to check every sig in the community.