I will support the proposal because as long as we can improve our sale system in the future to avoid the same confusion and mistake.
I feel that if people were buying under the assumption that it was still a pre-sale purchase and were not given notice that the pre-sale already sold out it sure will be a horrible experience and we need to have a clear improvement to prevent that from happening in the future (either stop the sale when it sold out or given notice that the purchase will not be counted before the purchase).
Also, the vouchers should be automatically applied toward bonus packs and given notice if not enough vouchers to cover the bonus packs.
As a community, I sympathize with and feel the frustration and pains of people that just missed the sale and have no way of knowing it therefore I am okay with the additional 10% inflation on the promo cards. I would hope for the same support if I was on the other end of the situation and I trust we can all learn and improve from this and come out better.