How to offer USD150 coupon to local businesses?

I completely agree....you are trying to sell a feature not a benefit.

The people you are selling to will be unlikely to know about adwords
so telling them about free vouchers is pointless..

Explaining to them how you can create a marketing campaign to drive hundreds
of hungry buyers to their business for next to nothing [to get started] because the
cost will be funded by someone else....now THAT would be a compelling message.

You'd have to show them why a company would be prepared to fund the campaign initially [otherwise it wouldn't sound convincing] and also explain the small investment they'd need to make [your fee].....

Then you'd need to sum up with the no risk promise.

I wouldn't worry about them claiming the vouchers and then not needing you.
It's 2017, if they haven't had the wherewithal to do something by now, then they never will....without your help.

Good luck.

Why do you let them believe that? You can explain how it works clearly.

You promise them that you'll do the set up and get them a $75 coupon they can use to run ads on Google or Bing, I'm sure they can be made to understand that you will do the set up and get them a $75 coupon to run ads on Google and Bing and nothing else.

It's not difficult to explain you can get them better results with internet. It's difficult to get them to believe that YOU can get them better results with internet. Social proof /; testimonials help. So does them finding you and your offer online on their own.

Ever read Dan Kennedy's The Ultimate Sales Letter? Read it, it's got the elements needed to convince people to buy from you and more.

Why is it important that they see their ad there in 20 minutes?

When they have no experience getting sales online, it's not just getting their ad seen that's the problem (or, more precisely, usually not only that) but also the ads themselves and the funnel...

Seen ads for plumbing items I wanted to buy on a guy's site, in the list of items available for sale. Clicked the buy button, was taken to a page that said I had to call the store. I called the store, gave him the item name and number and he said (he, the owner!) he had no idea what I was talking about, he does not and never had carried such an items. Why don't I call a plumber? he asked.

I got to his site through an AdWords ad!

You are seeing solid advice here Michael, practically.

From my view, you lack clarity in your offering, big-time. This is OK. Happens to most of us at one time during our online careers. But you want to get clear by erasing those doubts and fears because doing so will help you explain clearly how the process works, as DABK noted.

This is good strategy, especially if you follow through and tell people for whom it isn't working to stop.

I do think, though, that you should not be providing all the initial set-up work for free. Your new clients should have some skin in the game. Otherwise, what's stopping them from taking your free offer, getting their accounts set up and running, and then showing you the door and either managing the campaigns themselves or hiring their neighbor's kid to do it for cheap?

You can structure the deal to credit them the set-up fee against future management fees, so the net result is free set-up, but charging something up front will help you sort out the serious candidates.

Another thing. Is a week or two long enough to dial in a campaign and show positive results?

How do you get the vouchers? I'd like to try that approach in my area.

Yours Is The Best Answer Ever!!!! I mean it! (Just not to the OP's question. Did you at least read the OP's question?)