Like I said in the title, really. This game doesn't have a tier 8 premium artillery, just one at tier 3 and one at tier 5.
If WG ever decided to sell a tier 8 premium arty, you KNOW it would fly off the metaphorical shelves, and you'd never be able to play a tier 6, 7, 8, 9, or 10 tank ever again without seeing one. Maybe two. Maybe six.
And yet, there isn't. That's why I think that WG still cares, at least a little bit. I dearly hope it never happens, but if they ever release a tier 8 premium arty, that is when I'll agree that WG has finally given in to greed and decided to milk this playerbase for every last penny.
Now where's my KV-4 KTTS and my tier 8 premium Japanese derp gun heavy tank you bastards >:(