Over her decades of entrepreneurship, self-made millionaire Bethenny Frankel has walked the fine line between being a spender and a saver.

The Skinnygirl founder and "Real Housewives of New York" alumna says her habits don't regularly fall into either category. Rather, she says she's developed a sense for knowing when to splurge: Motivated by an intolerance for wasting money, she tries to only spend when the purchase feels "like an investment."