wHat MAkes yOu sO sPEciAL?

Why is it that in most cases capital letters are only used at the beginning of a sentence?  Or if the word is really important like a state or a name of something?  Are the other words in the sentence not as important as the first word?  I prefer to capitalize the first letter of every word in a sentence.  Some might complain about having to push the shift key too much.  Others think they won't know when a new sentence begins if there were too many capitals.  Isn't that what a period is for?  Now there is this new thing with the iPhone.  I is usually capitalized, because our Ego's are so big that we need to capitalize I.  The iPhone makes the first letter small and the second letter big.  Do they know something that we don't know?  Then if someone doesn't use any capitals at all they look really lazy.  For example:  johnny and susan came over for christmas and drove all the way from texas i had a great time.  It seems all the rules for punctuation have been thrown out the window.  i gUess i CAn lIvE wItH tHat.