The warriors were the errand boys for everyone. They had to do as said, because only they were mentally fit enough to do that, and they were also strong enough to defend themselves in case anything happened while they were out shopping.
The alphas had been clear about the attention not being on the wolves, but they were just saying that as a formality. If they had a better way of telling the humans fuck you, they could have. The warriors knew they wouldn't be able to hold back considering the humans had made fools of them for years and years.
Werewolves were very prideful creatures and the humans had looked down upon them for so long. They would just show the humans what it meant to be a wolf, but by using their money. They would buy and buy and buy without stopping. And they would fucking enjoy it all.