Contrary to popular belief, the 'complete proverb'  is not "Jack of all trades is a master of none", it continues with "oftentimes better than a master of one". 

From our inception in 2011, we aimed at keeping our (equally successful but seemingly unrelated) Cleaning and Painting businesses as separate entities for fear of not being seen as the highly specialized, best-in-class group of tradesmen and women we're known as.