TG'sFM wrote:
So if it's so good, how come mowing contractors don't use mulch mowers?

Presumably it's because mowing contractors have a better understanding
of appropriate equipment to use for the job than an aus.tv troll.
Mulching mowers work best on regularly cut or slow growing grass. If
you don't mow during periods of high growth the grass becomes too long
to be efficiently mulched. Mowing contractors are generally brought in
when the grass becomes to long for a mulching mower to work well so
it's more appropriate to collect the clippings.