Not to be Mr. Negative here, but I didn't like the idea the first time I heard it...and if I did like it, I don't like it now
IMO flyers have such a low grab rate as it is. Putting them in a disposable baggie just makes it easier to throw out. And not to mention the ones that don't get picked up adding to the litter that is already plaguing our world.
I know for a fact that by knocking on doors and meeting your potential client is a far better way then trying to market cheaply. I know you are trying to blanket your area quickly, but don't do it at the expense of giving the wrong impression.
Again this is my opinion...so take what you need from it, if any.