Your revenue source determines how much you spend each day. Not only bitcoiners, but everyone, there are those people who budget exactly what they will spend regardless of what they make daily, weekly, or even monthly, while others simply spend as they see fit.
I personally have a daily budget, however there are occasions when the plan doesn't work because of unforeseen circumstances.
We should always have an estimated budget so as to watch our spending. If we spend as we see fit we might end up running out of cash very soon and for those individual with emergency funds they'll have to touch them and they will have nothing left. I don't think we should based our spending on how much we make instead we should have a budget so when we make more money we can save more and increase our investment funds.
Obviously we can't spend more than we make unless we want to spend on borrowed money which is a very dangerous lifestyle. Budgeting helps alot and all Bitcoiner should development a happy of budgeting, it could be daily, weekly or monthly, we should budget anyways.