15okb is on average 4 seconds per player , over battlenet
average adding about 15 secs in a game (asuming multiplayers seed, and its a 12 player, and a buncha people dont leave cause of long dl)
thats a big deal, then figure that everyone your playing with has to wait this, most every time they play the game. (unless it gets popular enough that people download it from a website)
12x15= 180 (3 mins per game) wasted, vs the 3-5 mins it takes you to set up the trigger - the time the model took (which was actually more than 3-5 mins)
so lets just chalk it up as
3 min * TimesHosted, asuming your map is hosted 100 times (most maps on epic war tend to average atleast 500 dls, so maybe 100 host)
300 mins of life wasted on people waiting....
now if it actually enhanced the ingame experience, it may be worth it, but the same thing can be achieved easier