Yep, that's why their games take a long time to drop in price and why they seemingly don't have as big a problem with used games. The "casuals"

Or maybe, and I'm just guessing here, their games just have much more replayability thanks to their design and local multiplayer options (never stops being fun at family or friend gatherings) unlike many story-driven games that people don't really feel like playing through again once they've gone through the story so they trade them in for something else.

I think too many other developer tend to make more direct sequel, which improve on the original but are at the same time very similar game in term of basic design. So you end up with the original game becoming somewhat obsolete compared to the sequel.

While Nintendo are more likely to make a sequel which doesn’t just try to improve on the previous game but actually try differentiate it self from the previous title. So the original still has value compared to the sequel, as both games have their own identity. You see this a lot in Zelda series. The Legend of Zelda, Zelda II, A Link to the Past, Ocarina of Time, Majora's Mask and Wind Waker quite a lot different from each other.

It's a choice a lot of them make. A choice stemming from their desire to boot Nintendo out of the industry. They don't release their games on a Nintendo console so their target audience won't buy a Nintendo consoles. Then they use that to say; "We've decided not to release our game on Nintendo's home console because our target audience doesn't own a Nintendo console."

Or they just use the sales figures of cheap cash-ins/ports or lazy spinoffs as an excuse.

The 3rd parties divided the market. The 3rd parties are hurting themselves. Nintendo doesn't need 3rd parties, they never did. The GameCube and Wii are proof of that.

So every single nintendo advert ever aired in the last 6 years doesnt have dad paying new super mario bros with his kid. Or grandad and grandma playing Wii Fit?

Cmon.

So you're saying it's the hardcore folks who present an unsustainable business environment for publishers?

NSMB and Wii Fit are the only Nintendo games right? Google it and found out how many a Xenoblade or Metroid Prime Trilogy costs today.

The balls on these dude...

EA makes bad games confirmed?!

Also, i approve of Nintendo's message, if only everyone agreed since this is true

Same here. Never traded anything in.

That may be true.  Nintendo itself doesn't need them to stay afloat and profitable as a company.  But, we as nintendo gamers DO need 3rd parties.  We may love Nintendo games but we also wanto to play other types of games, and we are forced to buy a second console in order to do so.  After the Wii that became a common event.  But I'm still old-school and I prefer to own a single console.