The wealthy who flaunt it, who are the Joneses, are the only rich people you see. There's a bigger camp of frugal millionaires who shy away from the limelight and often are richer than the ones you see splashed over tabloid covers. The frugal millionaires are the ones you want to learn from, starting with some of their most sage advice.

1. Gilbert Gottfried, actor and comedian

One of the few famous folks who are equally famous for frugality, Gottfried highlighted his tendencies when he and his wife were featured on Wife Swap. When he said, "If someone else is paying for it, food just tastes a lot better," he was dead serious. From taking public transportation on dates to refusing to ever host parties because they are costly and people come just for the food, some of his moves are extreme but there's no denying that he's hung onto his wealth.

2. Shailene Woodley, actress

Woodley has made some headlines for her frugal ways, such as refusing to buy any new clothes except for red-carpet appearances (and those are often donated by designers). Her "I exclusively buy used clothes," quote had every teen girl heading to Goodwill. A proud thriftier who prefers to enjoy her fame and wealth under the radar, she proves it's possible to be a trending actor without driving a Bentley. She's helping to make frugal cool for younger generations.

3. Derek Sivers, founder of CD Baby

He sold his company for millions, but Sivers never let getting rich change his healthy money habits. "I've always been very debt-averse. I don't like being in debt at all, even on the small level. I never bought anything with a credit card unless I had that much money in the bank. The credit card was just a convenience. I never went into negative debt on a credit card, even as a teenager, because I just hated that feeling. They say that there are two ways to be rich: One is getting more money, and the other one is lowering your expectations, lowering your needs."

4. Dan Nainan, comedian

Nainan said it best when he talked about overspending's simply not making sense, no matter how much money you have. "Figure out how you can save money. Don't spend as much. Don't go to Best Buy--get it off eBay because sometimes it's a 10th of the cost of retail. Go to Craigslist. I use Craigslist and eBay a lot. You can save a tremendous amount of money because people buy stuff and they don't need it anymore, and it's cheaper than buying retail. You're not only saving money, but you're also buying something from someone so they're not throwing it out. That's helping the environment a lot. I mean, there are countless ways you can save a lot of money and not consume a lot. It's a win-win for everyone."

5. Matthew Tuttle, founder of Tuttle Wealth Management

Budgets seem too constricting to you? According to Tuttle, all that really matters is that you're at least saving something. "I'm not a big fan of budgets. I'm not a big fan of trying to impose that discipline on someone who just can't do it. I also find a lot of times spouses vehemently disagree when it comes to budgeting. What I am much more a fan of is, save as much as you can, and if you're saving as much as you can, as long as you're not going into debt, then I don't necessarily care where you're spending your money."

Being frugal is a crucial part of building and sustaining wealth. What good does a million do if you're filing for bankruptcy a year later? Get it, save it, and make it work for you.