My grandfather used to tell me, ‘A Jack of all trades is a master of nothin’.’ He sold Chevys for 30 years. I believe he was short sighted…. Knowing every brand possible when you engage multiple potential or current advertising clients gives you an instantaneous edge. A perfunctory appearance of knowledge of the guts of that business, even if all you know is their BRAND. People identify with brands, especially when they write checks to that name BRAND every week or month. Now use more BRANDS and get them to write more checks to YOU!