Possibly because there is not grass in every bee yard or at all
times of the year?

Or that if it were as easy as just using a handful of grass,
what mystery would there be for the uninitiated?

-----Original Message-----
From: Aaron Morris

.. with the ready availability of something free, which works so
well and can be discarded when through (a new one will be at your feet the
next time you need it), why all the discussions of alternatives that don't
work
as well or cost money or need to be kept in a tool box?