What I find is hlj puts up orders a little slower than other retailers, amiami has their open right on the dot for stuff like bandai's hi metal r line (they often list the pre-order open time in jst), but hlj can have up to a 30min delay, anyone who misses the window from amiami and others will flood hlj.
So if its a heavily desired item (like bandai's hi metal r, specifically the macross ones) you almost get an instant order stop within 10mins or earlier, which annoys me as I prefer hlj's private warehouse but if I miss the pre-order I have to hope they increase the allocation (common with tf's) or someone changes their mind (I end up bookmarking any missed bandai action figures and refresh daily, used to be a website that would send emails when pre-order listings open up but they shut down early this year, figinstock, no replacements)