my theory as to why Bandai released small quantities is because of all the negative comments the DX 25 got before it was even released... and Bandai might have decided to "test the waters" first... but by the time these small quantities were released the demand was actually higher than the supply... hence, the price gouging and re-issue in April. Unlike the SOC Daimos which Bandai made tons of (over-saturating the market) and was somewhat panned after release (due to paint chipping and non-anime accurate transformation) subsequently causing the prices to fall... it's just a theory
but i really hope they make tons of it when they do the re-issue so the prices will go down.