Because for 1, mumble is ass and bush league. Secondly, there are like 3 people in KGB playing DFO. The majority of those people in the DFO Alliance are...
1) you are an pompous ass
2) There are 6 people playing DFO
3) I used Mumble and it has come a long way. Worked fine and has some cooooool features. Get out of the 2000's and welcome to the 2010's.