Eh. We don't need text to show how greatful we are for their work. So long as we stay respectful to them and each other and follow the rules set by them, that should be thanks enough.
I'm not saying that we shouldn't verbally thank the guides and admin, but with these types of topics, when one person makes it, around 5 more people will create their own thank you threads and clog the boards.
People have made thank you topics in the past and if I recall correctly, most were closed for one reason or another.