Although number of users may not translate into a quality system (Microsoft is a prime example), number of users does translate into testers with some valid feedback, code contributors, vendor driver support, and money to pay core contributors (you?) among many other advantages.  The best advantage of any networking system comes when an increased number of people use it so that the value offered by the networking system can be utilized and appreciated.  There is value in a community.  On the other hand, you can live in a cave and do whatever you like if you wish.