These signs are basically physical spam. They're also popular with the kind of scammers who buy old people's houses for cash, and 1-800-GOT-JUNK. I yank them out whenever I find them.
What about the "earn $3,000/month from HOME!" signs?
Unrelated to Got Junk -- just correlated by a latent factor (telephone poles).
Some of the work from home ads are for jobs as "Financial Officers" or "Package receiving" where the "job" is receiving stolen goods or fraudulent payments and shipping them out of the country.
Ya, they were ranked "The Best Company to Work for" in British Columbia in 2004 and 2005. I'm not sure what that says about Vancouver and British Columbia in general though.