When Lums lived
Family-dining chain Lums couldn't decide whether to spell its name with an apostrophe or without one. Note in the ad the restaurant signage incorporates one, but not the logo or the name in the text.
The chain was founded in 1957 as a hot dog stand, and grew to more than 400 restaurants before going bankrupt in the early 1980s, according to Wikipedia. A few restaurants are still in business, but aren't affiliated with the original chain.
The franchisor was perfectly frank in the ad when it made the claim that the $35,000 investment was "substantial." But the ad then goes on to reassure would-be investors that the "returns are fabulous."
Lums, or Lum's, also sold "tall frosted schooner(s) of cold draft beer" - something not many hot dog places have on the menu.