I can understand that
Well, as part of a team with 6 friends of mine, when VS2013 was released, we bought the license of the ultimate edition togather, as we needed all the features to fullfill/match each skill of the team.
Nowadays, as Microsoft releases a new IDE every 2 years, we can't afford the fee each time, for only a "few changes"
So we stick with the 2013 as long as we don't see more advantages for us in the newer versions. Moreover, most of us are still under windows 7, not 8 nor 10.