Tier7: Isn't soulchest is 400 diamonds so it's 800 diamonds + crystal shrine (2k bazaar tokens, don't remember it's diamond price) + 1.2mil gold (300k crypt line for VIP10+) + Guild War tokens worth of around 9 successful attacks + 1 Almost 1 day of crypt tokens for 50 man guild member.
Tier 6: 150 diamonds, 2 gold chests (576 diamonds) + 800 bazaar tokens + soulchest (400) + some enchant crap
Not really that bad, huh?
No point in trying to get tier 7 alone, but you get it anyways for free while going for the skin.
tier 7 is just bonus for spenders who wil lget high scores anyway, tier 6 is old tier 5, most profitable, so it's a bless for lower spenders who don't need to go for tier 7 to get 2xNDD for example.