You can make just so many at any given time and starting a new product manufacture is not easy, it takes some time for production to ramp up. It's illusory to expect otherwise.
To have a great number of a product at very beginning of sales would mean to run production for some time before sales started which would inflict great loss of revenue in mean time.
Even after production starts, a product has to run gauntlet of wholesalers, distributors, preorders and scalpers to get to us "Ordinary users".