I do admit that i started doing this because i type fast and am generally too lazy to stretch my pinky all the way over to the Shift key just the capitalize one measly letter. I do, however, used spell check every once and a while, and i have chosen not to capitalize the word. As i though about it, i realized that it isnt really necessary to capitalize it. Likewise i dont like using an apostrophe in contractions. When i we combine two words, they become another word.
Languages do evolve.
While keeping rules helps to keep change in check, there should come a time when you realize that some things are not just slag, but commonly used words that should be integrated into the 'official' language. I personally dont think that i am all important or require too much extra attention. It is a small thing, capitalizing a single letter, but it is a symbol of basic human nature, making yourself out to be more than you are. This arrogance and vanity is one of the aspects of human nature that is most despicable. If everyone could get over their own ego and put a check on their swelled heads, the world might be able to shape up into a fairly decent place.