LBP is all about creativity and user-generated content.

because it is too much. you said there is also wario and so on but you simply see they are all from the same "world". wario or luigi aren't mario but they cleary have the same art style.

i love halo and the master chief but i would hate to get a racing game with master chief, a jump&run with a grunt and tennis game with cortana and whatever. ok better than not getting them but i would rather like to see nintendo bringing more games with totally different characters with totally different art style which don't remind you that it is still just a character out of the mario world.

Yes. And that has what to do with demographics?

this is a stupid answer and a way to think about it, people could call me a sony fanboy but honestly i just really love sony games and playstation consoles. but i dont hate mario, i actually love him! (Good for you! We need more Sony fans like you.) but what people hate is not the franshise its the way nintendo treats the franshise, everything they make is either mario or zelda (Let me stop you right there. Zelda is not made that much. I think it is on a yearly level, correct? That's one Zelda game a year, you are acting like they make at least 2 Zelda games in a year. Which would be dumb.) (for consoles) and mario is just freaking everywhere! It's their mascott, of course he is! they been milking the franshise for about 30 years now, its just way to much! the N64 is my second favorite console and i probably finished super mario 64 a million times, but after that nintendo did nothing new with the franshise, well nothing major. mario 64 was a jump from the 2D world to the 3D, but after that what happened? (Is there really that much to do to it? If you change it too much it wouldn't even be a Mario game.) yes new gameplay but what about the story? "bowser kindnapped the prinsess go save him mario!" thats literally the hole story...... 

What a game is about doesn't have anything to do with who it appeals too?

You said Mario and LBP have practically the same appeal, LBP is all about what Mario isn't. (creativity and user-generated content). The only thing they have in common is being a platformer...

Maybe Pikmin 3 has garnered more interest because it's something fresh from Nintendo. Sure, it's not a new IP, I do notice the "3" in the title, but it's fairly new and hasn't had countless predeccessors, or it's main character(s) hasn't stared in countless other games.

OT: Personally, I just find Mario completely uninteresting, and I can't see why anyone over the age of 12 doesn't feel the same unless they're just nostalgic. Nintendo doesn't seem to be doing anything meaningful (to the gamer) with the Character, he's pretty just a money-maker. E.g. What does Mario have to do with Tennis? Something like Super Mario Galaxy could of been a new IP, but it was a Mario game because they played it safe and knew it would sell a ton. Now, that's a great business decision, but for someone like me, seeing Mario plastered across the title of a gazilion different games is tiresome.

It is quite annoying to see Mario "plastered" on almost everything. Even many Nintendo Fans feel Mario needs more breaks between titles. (Like Mario games only 2-4 times a year depending on a new console release.)

Btw, Mario Galaxy Series was thought up to be a Mario Game. That's what they wanted and decided it to be.

It can, but in this instance the demographics clearly match up, so it's entirely moot.