I think it really depends on the dog. All three of mine are allowed on the bed, but only one demands that she sleep in the bed... yep you guessed it - ILSA.
And I know why - once she was potty trained, she never had to sleep in her crate, she was always in my bed. This is sort of a bad thing - now, she hates to sleep anywhere else, which sometimes makes it difficult when traveling or when I just want to *stretch out*.
If you do let Maya sleep in your bed, don't make the mistake I made. Be sure she still has some nights in her crate, or when she's older on the couch or dog bed, etc.