In my experience, unless you have a really small budget, or your products or services just aren’t viable, then there really should be no good reason not to use the largest search engine in the world, Google, to help grow your business.
In the end though, it will all come down to money. If your advertising brings a good return, you'll keep using it! If not, you'll stop and tell everyone it doesn't work!
However, if you don't know exactly what you are doing, it probably won't work. Which is why you choose an expert to help. Not only will it save time and money, you'll get a stream of high quality, highly targeted leads to help grow your business!