Just an odd concern for an end user, IMO. When I go to buy a car I don't look at the profits of Honda vs Ford. Sure you may not want a company that will go bankrupt, but even if they did the impact really isn't all that huge.
Why is it so hard for Android manufacturers to release updates for their phones?
Because they make deeply integrated skins. They have to reintegrate the skin with a new drop from Google -- not on their schedule, but on Google's (that's when customers start screaming for the update).
Because they don't make enough on them to continue supporting them. They make money on new devices sales, so they keep churning out more new handsets.
Everyone makes money on new device sales. The difference is if you get an iOS device -- Apple gets the profit. HTC/Samsung/Moto/LG/etc have to compete for the next sale, even if you've already decided it will be Android.