Why does there have to be only one figure? Or one set of figures?

Well said...I use many different figures. I use Genesis 1 and more recently I have started to use gen2, Hivewire figures, Star and also many older figures including those awesome figures by Nursoda. 

Who vendors choose to support is up to them, and that is as already stated a business decision, but as a hobbyist who does this for fun I have the freedom to choose how and why I spend my money. Also, I have the choice(which is also a preference) of making stuff myself for my chosen figures.  Sure I don't buy as much as I once did but I am developing (admittedly very slowly) my own skill set so I don't have to worry about whether something I want is in the market place as I can make it for myself.

I've been watching this thread to help me assess whether to buy Scarlet and funnily enough the thing that is making me think about it is Zev's conversion to DS.

We all have our different perspectives and needs...