Take the example of vBSEO. Since 2005, their main product has been a plugin that addresses the missing SEO element in vBulletin. You would think that vBulleti

Take the example of vBSEO. Since 2005, their main product has been a plugin that addresses the missing SEO element in vBulletin. You would think that vBulletin would either build this functionality into newer versions or buy vBSEO, but it hasn't happened yet. In fact, with several patents for SEO technology, when it does happen, they'll probably have other products and services ready. I think starting by improving an existing moustrap gives you enough of a headstart over startups building entirely new mousetraps, that once you have market share and profitability, you can branch out into other areas.