To be honest, beyond that our goals were rather vague; we wanted to be a collaborative entity of some sort, and we knew and respected each other as people who wanted to make Vocaloid and UTAU work seriously, and felt we could make some pretty great things out of that.
We don't work exclusively within the circle -- in fact we collaborate when we feel it suits our whims -- and while we're a tight group of friends who trust each other deeply with each other's work and development, we formed that relation *because* of our work in this group.