Either spend it online or offline, the main purpose is to spend our coins to make it a stronger currency in future, and now we also have an option to convert it to fiat or use bitcoin debit card.
I am pushing that too with my colleagues they just let their bitcoin rot in their wallets. They say it will grow. Yes I know that it will grow but if all of us will be like that then how could it move. Economy might get bad.
Yeah and the number of coins will not grow only by holding, yes they can make higher profits if price goes higher but its always good to spend them and rotate the coins to help the bitcoin economy.
I don't think most of the users are holding their coins, as majority of users are spending them on gambling sites to make quick money, very few would be making profits but at least they are helping bitcoin economy by spending them.
Spending bitcoin is normal but if you really want to increase the amount of bitcoin better to be wise and spend it wisely that you know you can multiply your earnings.