you will never be able to buy bitcoin and spend it in the same day and the totals balance out
So there will be *no* incentive to spend them then isn't it?
How would bitcoin ever succeed when they are not going to be spent?
Merchants can offer discounts when paying with Bitcoin (when you paying with credit card merchants have to pay few percent to credit card company).
But I doubt the discounts can offset the Bitcoin exchange fee + bank transfer fee (when you buy Bitcoin with your local currency).
So Bitcoin will be best used once you receive Bitcoin payment for your work, this way it becomes much better spend the bitcoins instead of exchanging to your local currency...