it isn't really i think every one should have every thing....
is just people have lives and work... not every one can be online at (X) time of day.
with this in mind maybe try and have some great deals popup threw out the day in random stalls
i use to work for retail and some times we should say we were out of some of the big things so we could bring out a fresh pallet/display of them with out getting run over by people trying to get one first... also keeping the shipper on it till it was in position so people couldn't see what we were trying to bring out.
*people are crazy on blackfriday* lol