It's the shiny toy syndrome - as soon as a new one appears people seem to lose interest in what's around at the moment.
No reflection on the quality of the gun - I'm not shocker-savvy enough to know what constitutes new or old (apart fropm the ones with the early boards that wouldn't stop firing and had to be beaten unconscious), but I've seen a shocker in action and thought it rocked.
Get one myself some time but I'm a total pauper and they'd need to be even more unpopular! I have a phantom and automag, second hand, also considered to be old and unfashionable, both work great, both picked up at very cheap prices!