What is the deal with cable descrambler plans?!

[frankc <frankc@srv.net>]

These people trying to sell cable descrambler
plans have got to be stupid.  If you have enough
smarts to build one then you probably have enough
smarts to design and build your own.  It is an
interesting subject, but why would anyone buy
plans for it?  Some of the schemes are soooo
simple it is not funny.  Some put an audio signal
in and others invert the video signal.  A notch
filter and an OP AMP can take care of these
schemes easily.  Anyway, I know this is off
subject, but I wonder how many idiots have bought
the plans.

Frank