As small business owners, we work extremely hard to make every penny that comes through Paypal. Where does that money go? You spend them on supplies, listing fees on Etsy and on a new tool you've been wanting to get for months!
You've probably also encountered moments in your business where you are asked to spend money on marketing. A blog sidebar ad? Giving away products (that cost you money to make) for a celebrity gifting suite? Were you approached to work with a social media agency?
Whatever it is, you'll first have to ask yourself these questions.