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4 champions per week, that's 8000 gold and 8 wood and ore. For the Angels, it's 8000 gold and 4 crystals. A champion has 150 HP, and losses are inevitable when fighting against 4th or even 3rd-level champions. Unless you have the Resurrection skill or spell, but since you're only playing with Whirlwinds, you won't have spells. And if an Angel gets low, it can resurrect itself.
The increase in wood and ore is two per day, so if we look at it that way, 100% wood, 100% ore versus 100% crystal, the difference isn't four times, but two times. And as a rule, wood and ore are resources that aren't used as often after you've built the Champion Arena, and it seems like buying them would be cheaper!