I would not break NAPs, and all the top players I know do not break NAPs. And the fact that they don't break NAPs I believe is an important part of their strategy.
Many people view NAPs as an out of character agreement, just like trading items or gems. I am one of those. There is not much roleplaying in most of the games I have played. And the NAP breakers I have spotted do not roleplay.
As a player who does not break NAPs, I believe I can play more strategically, as I have to be careful who I make NAPs with. By making NAPs with a player who does not break NAPs, my back is protected to the extent of the NAP. I would not make NAPs with a NAP breaker, as that would put me at a severe disadvantage, as I don't break NAPs.
In my experience, NAP breakers are very few. If you consider only players who have played more than 5 MP games on these boards, the list is even fewer.
For me, the scheming and plotting comes before the NAPs are signed. You fake strength, cajole, threaten, bribe others to sign the NAP. My diplomatic energy is spent there, not on trying to convince others why breaking that NAP is justified.
And I love these threads, I visit them from time to time, especially when I'm offered a NAP by someone whom I have never played against before
