It's not really "beta" -- I mean, they take player resources, that's not "beta" anywhere. They merely tag it as "beta" so they could make more changes without people being too upset or at least to have an argument should players get upset. Basically the "beta" tag gives them a default "out" for any complaint, that's all. If it were really "beta", it'd be free to play until all the bug are worked out. Or they'd be awarding the SOW back to the players after each battle and typically there'd be no actual rewards or exceptionally minimal rewards.