Saving your 10% of monthly income will help you to buy something you want in every year because if you are going to hold you bitcoin or money just for anything you can do that because in bitcoin world theres no possible in hard worker man you can rich every thing you want just trust your self.
I would not make it a fix 10%, though I think it is a good idea. Some earn barely enough for the expenses that deducting 10% for savings is too much. It actually depend on your income. It can be 1% or 10%, but you must train yourself to regularly save something from your salary for the future. The thing is, you must get yourself accustomed to savings. So when your salary gets higher, your priority is to save more not just spend it on worthless items or extravagant.