Advertising, done right, is an investment. An investment in growing your business over time.
It's also a leap of faith. You're sending your money off with no guarantee anything will come back. But isn't starting your business a leap, too. You're taking steps to succeed when friends and family may be discouraging. You've decided that the only way to get ahead is to close your eyes and take that leap...trusting that the net will appear.*
It's important to note that advertising success takes a little time to begin. We're constantly bombarded by advertising and tune much of it out. That's why viewers don't always notice your ads in the beginning. After they see them multiple times they begin to break through the filters and get noticed. That's why repetition is so important in advertising.
* American conservationist John Burroughs, 1837-1921
His actual quote is: "Leap and the net will appear."