The cost of stamps

Once upon a time, there was a very keen player, an 80-game at a time man. To protect the guilty, we shall call him “Nathan the Nutter”.
And so it came to pass that the government of the land, for the third time in just a year or two, decided to raise the cost of postage. Now for a busy player like Nathan, this was not good news. As a matter of fact, he saw this latest impost as both capricious and unjust. So unjust in fact, that a man should protest at such injustice.
So Nathan went unto the post office and bought their entire supply of 1c stamps. After addressing his moves, he then plastered the envelope front and back with 1c stamps. He figured that if they wanted more money, then they should frank more often !
Nathan’s opponents, astonished at this excess, sent in the evidence to the committee. We could not decide exactly what, if anything, was illegal about the behaviour, but all agreed it was darn peculiar!