You sound like a vet and a pro, so you probably don't need this, but here is what one of my favorite consults says.
http://www.paulweyland.com/managing.html
http://www.paulweyland.com/calculate_ROI.html
http://www.paulweyland.com/valuenewcustomer.html
I didn't see an articlc about the following point but I'll paraphrase. Weyland also in his speeches gives a good story. I'll try to paraphrase it. Paul wears glasses. He sees ads for new glasses all the time. He ignores all of them, they just roll off him. Why? He doesn't need glasses, he's got them. But one day he sat on his glasses. All of a sudden BOOM, every newspaper, radio, and tv ad about glasses he spotted and took note of because NOW he was "ready to buy" (ha! ready? He NEEDED to buy!). Same with me, BTW. I was in the market for a car for a little while and so I really paid attention to car ads. A month ago I bought a car and now I don't pay car ads any attention at all. They don't apply to me, at least not anymore and for the next few years. People are light light switches for certain products, they are "off" for information about glasses/cars/furniture (because they have them and don't seconds) or they are "on" because theirs broke down/fell apart/got too old, etc.
Now, about your case, I highly doubt that people with, say, new furniture or even passable furniture will throw out their new living room sets just because they heard an ad on the radio, no matter HOW good/funny/memorable it is. And since furniture isn't a "fast moving consumer good" type of business, the people in the market for furniture at any given time will be small, very small. BUT everyone needs new furniture eventually and occasionally. The hope is that THEN they will remember "that place with those funny/cool ads". In, say, two years from now, when some of those people who stopped into his store DO need a new, say, dining room table, they may very well
Put another way, this guy is selling a slow-moving product (because of the length of the products life line), but expects an immediate result from an ad campaign. This will NOT happen IN HIS LINE OF BUSINESS (except for a small, one percent or less of the population, for whom the ad is applicable at the time like in my example of glasses, cars, etc or unless he offers and absurdly good deal like a 99% discount) simply because of what he is selling.
This guy sounds like a typical hard-charging entrepeneur who wants results from an ad campaign (understandable) AND HE WANTS THEM RIGHT NOW GODDAMMIT! Sorry, that won't happen in the furniture business. His ad campaign should be long-term branding, not "immediate return" advertising. He should EXPECT results BUT NOT IMMEDIATELY.t
It's about client expectations in this case.
Or he might just be another client from hell!
Good luck!