Who Here Has Had Success with Yard Signs?

I'm a part of Home Service Accelerator and one of the main things they recommend is to use unbranded yard signs and put them in high value areas to get leads. It's a volume play. Basically you put out 100 signs but if you book one job (in my industry) it pays for the $400 in yard signs you spent (plus your time). 

Now I should mention I haven't been super consistent with this which I believe could be my issue. I also don't know who would hit up a yard sign for a kitchen remodel BUT you never know. My process to find where to put them is to go on the USPS website and find the mail routes with the highest average income then determine which streets to put it on from there. 

Is anyone else using this strategy? I'd love some pointers if you are having some success with it.