because warmahordes gives new stuff for the same faction every few months and not every few years [decades in case of some armies] ? it is different that you know that unit X is going to be there next year . then play let us say chaos and get 0 new models for your new dex and the first actual model updated years after the codex becomes legal[the demon prince] and even then its still 1 unit .I was at Privateer Press' Lock 'n' Load convention this past weekend & they were showing off sketches of models that are coming out NEXT YEAR. And no one was pissing or moaning about having to wait a year
Imagine you play khador and you get updated in mk1 and then you get 2 new units in 2 edition later . People would touch khador with a stick .