>> There are very few examples of startups which start with a product with features highly specific to one group of users and then expand out succes

>> There are very few examples of startups which start with a product with features highly specific to one group of users and then expand out successfully to a huge market. There are very few examples of startups when successfully address a huge market with any strategy. Succeeding in a vertical is a positive step, which most startups fail at. For one thing, it give you enough money to keep trying for a larger success.