@Eddy i'm guessing that it's more then possible, that after first batch is sold out there might be later on other potential customers that found out too late. Not just for this case/block, but also for future and for other blocks, imho worth for Alphacool to set up some service/webpage for sake of gathering preorders for blocks not in active production, with list of all your blocks of past, current preorder count and goal target for rerun.
Probably, to ensure that preordering customer doesn't back out, eg. 50% advance payment should do.
Probably with provision that if in year (or whatever other arbitrary timeframe Alphacool considers reasonable to wait/gather group of buyers for another run of some block manufacturing) enough buyers not reached, then choice to preordering customer for refund of advance payment or prolonging waiting to next time interval.
This way imho Alphacool can be sure that blocks will be purchased w/o turning into unsold deadweight in inventory that needs from time to time be cleaned up with big discounts at loss, and late customers will have extra chance in organized fashion (and ability to track progress of group-buy number) to get some block even after it's discontinued or after small initial batch got sold out.
Also such page could be used for estimating real demand for future blocks, that you are not completely sure if demand numbers of them will recoup R&D & manufacturing costs, in less nagging and more organized fashion then this thread became
. And when another thread of not-yet-made block pops up, users can simply be directed to such preorder page i described of.
I hope i didn't produce something unusable/stupid/mad with this idea, but maybe something that might be deemed useful from business sense as well