Here's a simple poll.
Most architects, engineers and contractors should be in the middle category. If you are there, without a drop of modesty, I encourage you to purchase my Construction Marketing Ideas book. It contains practical ideas and suggestions about how to market effectively without wasting your money.
Ironically, I have no trouble selling my book to marketers in the third category, who will spend enough money on a single campaign to equal a couple of years budget for you if you are in the second category. Not a problem. These marketers are serious about business and understand the vital importance of marketing to take their business to the next level.
If you "don't market," it won't take much effort and certainly very little money to move to Category 2. Go for it. You won't find better reward for your risk in virtually anything you do.