This is a simple, yet extremely smart answer. It's short and contains a really big truth not everybody is able to see.
It's also good to point out that the people holding is helping Bitcoin, whether they know it or not. The more holders and people using Bitcoin to buy stuff the more stable and widely accepted Bitcoin itself will become. If you are doing it for profit or if you believe in the potential it certainly contains for the future doesn't really matter - Actions speak louder than words.
My personal reason for using it is confidence in what it can achieve and adverse conditions around myself. I certainly hope increasing my participation in this aspect, even when the adverse conditions are not there anymore. This currency and the technology behind it have huge potential for the future.