Nintendo also has the somewhat unique position of being the only one providing high-quality games in a variety of categories. If you want a couch racing game, you're playing nintendo. If you want a 3D platformer, you're playing nintendo. If you want a couch party games, you're playing nintendo. In fact if you want couch co-op at all you're playing nintendo, pretty much everyone else gave it up because you lose money.
There are a number of great studios which happen to have financial ties to a given publisher. If you like these studios you have no choice but to indirectly give money to the publisher in question.
One obvious example for Nintendo is Monolith Software.