The wide ranging benefits of integrated marketing are well-known and always viewed as the optimal way to sell a product or service - however there is one great thing about doing multi-layered marketing like this that I haven't heard talked about. This is what I call Competitive Cloudiness.
Competitive Cloudiness is the what I define as the inability to understand which, if any, marketing tactic is really driving business results, therefore making it almost impossible to perfectly analyze and copy the strategies and tactics of another to achieve similar results. For example, if you launch a new product, increase TV advertising, do consumer sampling, and drop a coupon, and your business grows at 5%, I really can't look at your growth and just replicate it, because I don't know which "thing" that you did gave you the increase. In situations where a smaller or less resources competitor cannot match you dollar for dollar, I would recommend employing this tactic, as opposed to spreading things out and doing one thing at a time.
Seeming ubiquitious to your consumers is an obvious plus, misleading and confusing your competitors is the gravy.