17" wheels appears a big factor according to the article. They've gone quiet on the "Only competition makes it worthwhile" stance.
The R&D opportunity must make all those gazzilions of $$$ worthwhile I guess. R&D by supporting only a few teams surely makes more financial sense? I suppose at least they can't lose and get all the exposure.
I gotta say, Bridgestone or any other tyre company being in Moto GP never made me think I should buy their tyres, but that's me.