Storm's are not cheaper. Their premium balls are in the $140 range, on the internet, with delivery included. Only some small companies, like AZO, Lane#1 and Lanemasters are more money on average, on the internet.
SOme RG's are ... less expensive. Market penetration?
Focus has not changed. Just because one new ball, the Invasion is earlier than the VG does not mean that focus has changed. Most manufacturers are making stronger balls that hook more at the backend:
Mutant Cell
C-Systemem 3.5
Craze
Black Widow Sting
Evolve
(a few examples)
Most TRUE heavy oilers must grab earlier to handle true heavy oil. The VG was never a true heavy oiler. The Invasion is intended, I believe to handle true heavy oil.
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"None are so blind as those who will not see."