There is no exactly any incentive to use your coins when they might be worth 2x or 3x of current value in a year. Plus, you need to have access to your coins if/when Hard Fork happens.
Exactly,this is the point of spending the coins, we need to circulate it to the market. We need to help bitcoin to grow. You know what once we hold long the bitcoin the developers will be urge to produce many coins.
Not everyone wish to spend their coins and will not spend until the price of bitcoins have their target price as bitcoin is a pure investment for them so they will sell or spend them only when they are making enough profits from it.
I think it is better to spend a small percentage to help the circulation.
Yeah and I think everyone is spending certain percentage of their coins on trading and gambling sites hoping to make quick money and which is also helping the circulation but those who don't have any knowledge of trading and gambling will prefer not to spend their coins and will hold them for the future.