No One Piece - The only rule my wife guards. I had this rule after reading the manga, my wife keeps it as we watch the anime together.
No Dragonball - Self imposed, lack of self control, I'd buy everyone.
No Gundams/Robots- Sayla is tempting though, but she's not a Robot per say. same as the first two, there is no limit to what I'd buy...
N̶o̶ ̶S̶t̶a̶r̶ ̶W̶a̶r̶s̶ - Fuck you hot toys. My wife forced me down this dark path. Thought the prequels killed the fanboy in me... They did, but not the fan girl in my wife...
N̶o̶ ̶v̶e̶h̶i̶c̶l̶e̶s̶ - Metal Slug tank, though that may be a one off. Too big, no space, still a sorta rule, but it has been broken...
N̶o̶ ̶N̶e̶n̶d̶o̶s̶ - Lack of Abyssal merchandise sent me down this road.
N̶o̶t̶h̶i̶n̶g̶ ̶I̶ ̶d̶o̶n̶'̶t̶ ̶h̶a̶v̶e̶ ̶a̶ ̶v̶e̶s̶t̶e̶d̶ ̶i̶n̶t̶e̶r̶e̶s̶t̶ ̶i̶n̶ - LOL This was the first one that fell. Random Anime bimbo's are best...
N̶o̶ ̶D̶c̶ ̶D̶i̶r̶e̶c̶t̶ ̶p̶e̶i̶c̶e̶s̶ -Bombshell Batwoman/Catwoman Batman B&W Mignola re-re-release, reason for having it was they are so tiny and quality control seemed iffy.
N̶o̶ ̶H̶o̶t̶ ̶T̶o̶y̶s̶ -That Lego set I was gonna by is more expensive then this, let me get one.
N̶o̶ ̶1̶/̶4̶ ̶E̶n̶t̶e̶r̶b̶a̶y̶ ̶f̶i̶g̶u̶r̶e̶s̶ - Sold off my Japanese 360 and Cave Shump collection and wanted something awesome to put the money into... Joker
N̶o̶ ̶S̶i̶d̶e̶s̶h̶o̶w̶ ̶S̶t̶a̶t̶u̶e̶s̶ -Hellboy and Queen of the Dead told my reservations to fuck off, Court of the Dead line sealed my fate.
N̶o̶t̶h̶i̶n̶g̶ ̶a̶b̶o̶v̶e̶ ̶£̶5̶0̶0̶ -The Berserk statues are how much? Fuck it I'm still in. I've been a fan since 1996/97 (when ever the tv show came out) and used to video tape trade to watch it...