That's true, it all depends of the kind of the company. I can't imagine a bank to use these kinds of advertising methods, since they need to look credible.
I have seen some of these sorts of advertising (where they tell you to go to that site and give you no clue about the purpose of the site), but I don't think it works that well. People are interested at the moment, but when they're on the computer they have forgotten it most of the time, or they simply don't find it that important.
For what kind of site do you want to use this advertising method for, lockwolf?
The only problem with this is they will be driving. Who is going to remember a website they saw on a sign after they get home from work? Not I.
whats the condition of the weather? b/c surely I would charge even more during the winter then i would in the summer.
That sounds like a good idea I see people doing that now, but they like in some costume advertising some fast food plane or soemthing. I wouldn't pay for that but I think good companies that make alot of money might think that's a interesting way to advertise.
If I was selling boxer shorts (and you were wearing my brand while holding the sign) then yeah maybe I'd pay something but other than that, I think the return-on-investment in that kind of scheme would be questionable. You'd probably get a much better response by walking down the same street passing out business cards. At least that way people wouldn't be troubled with having to remember the web address.