Is there any reason aside from price increase when a user holds it's bitcoin?
It's all about the price and not the technology. People are holding because of money.
I think the best reason to motivate people using and holding the bitcoins is really the price and the money, and it's normal mate people need money and treat Bitcoin as real currency
Yeah true. Without it's fiat value bitcoin will not be become popular compared today so the thread title is really obvious to answers.
Majority holds because of price because that is the way it used to be.