The problem with your conclusion that 'anyways' is a misspelling and you chose it because it is popular (high 'frequency') is that it displays a common misunderstanding purists have of a language's evolution.

As Jorge Luis Borges once said, all words were once neologisms.

For something to be standardized or make it into a dictionary, lexicographers look at its popularity. If we reduce language to the most simplest idea, it is exactly this: a set of popular phonetic sounds from which humans derive agreed similar meaning.

The phenomenon of adding an extra sound to the end of a word is called paragoge.

For anyone that is interested and is not familiar with it, linguistics has a lot to say on the addition and subtraction of sounds at the beginning, middle, and end of words. Here is a link: http://en.wikipedia.org/wiki/Metaplasm