What county do you live in? The ones made for the US can't replace batteries.
And no iPhone don't hold value because they are the most reliable. They hold value because dick riders are too busy deep throating apple to look around.
At one point it was so bad Apple users were discriminating because of text bubble colors. Nevermind the fact that Apple refused to update beyond basic SMS and that all other phones had the freedom to just change the damn color and not care