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Excellent! So what exactly makes you think that CDM is preferred to MOND if CDM fails to predict galaxy formation and requires elusive WIMP particles, while MOND models galaxy behavior correctly and the correction to inertial mass required by MOND is below what we can measure?
Stop - MOND* does not model galaxy behavior correctly. Thats exactly the fallacy. MOND is "We have no clue, but we just fit the rotation speeds of stars in a galaxy to a function."
The problem is: MOND works for spiral galaxies. MOND does not handle galaxy evolution well, elliptic galaxies are extremely annoying. Motions of galaxy clusters are violating MOND, so some MOND proponents invented a new function that they can fit over the observation data (Others introduced dark matter for fixing MOND in that case, oh the irony). Still lacking a prediction, any newly measured galaxy in the universe can be enough to break MOND. Especially noteworthy is, that the [ame="http://en.wikipedia.org/wiki/Bullet_Cluster"]bullet cluster [/ame]invalidates all current MOND variants, while it confirms the Lambda-CDM model with its observations.
Now some question for you: If you can't see a mass, but can sense its gravity, does this mass exist or not?
* Modified Newtonian Dynamics
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