Yes, I agree that the UI was not good, and I have no doubt that those players that didn't add their vouchers for bonus packs would obviously have wanted them. In fact, the only reason I got my bonus packs, is because I declined the confirmation, because my bonus packs didn't appear in the confirmation. In this aspect, the UI was identical to the Chaos Legion pre-sale. After declining the transaction, I saw that the bonus pack window had fully appeared, I filled it in, and completed the transaction, meaning I risked the possibility of missing out on the pre-sale entirely. Luckily that wasn't the case for me, but with 96 seconds only, there isn't a lot of time to lose.
That being said, the 500K per-sale packs are all gone now, and getting a piece of those 500K packs was the reason we all showed up. I don't support expanding that amount. Had you succeeded in putting the vouchers, that would have pushed another player out of the 500K. Or perhaps not taking the extra few seconds to fill in your vouchers is the reason why you managed to get in the 500K packs in the first place.
I absolutely support allowing those who missed out on the bonus packs to use the vouchers to get more packs, but I think they should be general sale packs.
If you noticed, the TowerDefense pre-sale was also a completely different UI then compared to the RiftWatchers, with some similarities. You first had to press 'buy now', with no option of scrolling down, and then then put in your vouchers and payment method.
Cheers!
RE: Riftwatchers: Success, debrief, request, proposal, and future sale plans