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Will you see how it goes in general and see if buying "key cards" from the market is better to max, or do you think the rental market will be strong enough for the extras anyway?

Also there is one more round of presale left.

Rental market will be decent I think.

I think I will have enough for maybe 300 packs, but I am thinking of saving vouchers for the bonus. If I understood correctly, at the open sale vouchers will still be needed.

Yes, Vouchers will still be needed the next round. But with double emission it probably will hurt voucher price. Also no dr blight later