Ya its the number of consoles that are making them sell so well, The Nintendo titles themself have always been quality and sell very well even the many many sequals always sell over a million at worst.
Nintendo is one of the very few companys that can recycle an idea over and over and it still is a blast to play.
Biggest problem with Nintendo game sales have always been how many consoles are out. Nintendo only releases games on there own consoles/handhelds, pretty obvious I know.
Still Nintendo has always had the best selling games, the only thing that has ever hurt there sales numbers is the acctual console/handheld numbers themself. If Nintendo were to release there 1st party games on other consoles/handhelds you would never see any other game publisher even get within the same level as Nintendo.
Top 10 Selling games of all time. All Nintendo Titles
Super Mario Bros Nintendo______________________40.24 Million
Pokemon Red / Green / Blue Nintendo ____________31.38 Million
Tetris Nintendo_______________________________30.26 Million
Duck Hunt Nintendo___________________________ 28.31 Million
Pokemon Gold / Silver Nintendo__________________23.11 Million
Super Mario World Nintendo_____________________ 20.61 Million
Wii Sports Nintendo____________________________19.75 Million
Super Mario Land Nintendo______________________18.14 Million
Nintendogs Nintendo___________________________17.66 Million
Super Mario Bros 3 Nintendo_____________________17.28 Million
I know some of them are also games that are bundled with the system in most area's, but honestly thats just a smart idea on Nintendo's end. Not only do they sell the most games but they have the lowest priced consoles and give you something to do outta the box. We can also start to tack on some more to these numbers now that VC copies of them are selling very well.
If Sony would have done this with the PS1 or PS2 they would have the number 1 and 2 slot for best selling game. Xbox and 360 would also have made the cut into the top 10. Problem is its hard to include a free game when your already taking a loss on a console just trying to compete. Nintendo seems to be able to do it just about every time and still pull in a profit.
Nintendo earned the rejuvenation, it has been a few years for them to have this kind of sucess. Go Nintendo Go!