Do you know the history of the "allowed seeds" law? I assume greed is in there somewhere, but there's usually some other bizarre or novel justification for that sort of law.
Some of the justification I can see is environmental/economical. As per my sibling post - it's there to make sure that a rogue seller doesn't accidentally or intentionally cripple national food production by introducing a crop that is prone to disease and infects/crosses with everything.
However there is also "breeder's right" which is more debatable.
I'm not sure what actually happened (IANAL), the original proposal came under a lot of fire from retailers and gardeners: http://www.realseeds.co.uk/seedlaw2.html
