By whom, and for what purpose? your theory now includes:
1) Hoaxers,
2) aliens,
2) conspiracy,
4) an attempt by the aliens to communicate by essentially
the most ridiculous and difficult means possible, rather
than by some simpler means.
The competing and simpler theory includes:
1) Hoaxers.
Please note that crop circles have followed the usual path for
this sort of phenomenon: additional elaborations are "discovered"
only after the original incident is shown to have a natural explanation.
The people who are initially fooled and go on record end up with
a huge psychological incentive to continue to believe, rather than
recanting and thereby looking foolish, so they selectively
grab at new observations and facts that support their position.
This is called "resolution of cognitive dissonance" and is a
well-known phenomenon.
This will be my last post on this topic on this list, since
I feel that it is off-topic. I recommend you look into
The psychological phenomena of belief a bit. Try Sagan's
"the Demon-Haunted World" for starts.
We investigate a lot of radical ideas on this list, but
we try to stay firmly grounded in science. The real universe
is so amazing that IMO pseudo-science trivializes it.