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For credit card companies, millennials are the Holy Grail.
In sheer size, they outnumber any other demographic. They're also spending more than other generations on everyday purchases such as groceries and gas, as well as on experiences such as dining out, according to a report by Bankrate.com. And, because they are just starting out, they have the potential to be very long-term – and lucrative – customers.
"Credit cards that appeal to millennials with good credit and high incomes are a big push in the industry lately," said Ashley Dull, the editor in chief at CardRates.com.
Banks are also specifically partnering up with the brands millennials know and love. New reward card contenders include the Uber Visa, Ikea Visa, Amazon Rewards Visa and a soon-to-be-released Apple-Goldman Sachs card.
And it's working. Credit card originations from consumers ages 18 to 34 rose 10 percent from the same period last year, according to TransUnion's latest quarterly report.
However, rewards cards, which dole out points when you make purchases at airlines, gas stations and restaurants, aren't always as good as they seem.
For starters, these credit cards generally have higher-than-average interest rates to compensate issuers for the additional perks.
So the benefits of using a fancy card are quickly negated if you carry a monthly balance.
Further, depending on how much you spend each month, signup bonuses and other rewards don't always offset the cost of an annual fee, which can be as much as $450 depending on the card, according to WalletHub's 2017 Credit Card Rewards Report.
On the other hand, don't rule out a card entirely because of the fee. Often these cards have better initial bonuses and higher earning rates than cards without a fee. For big spenders, it is easier to rack up enough charges to reap the benefits of a rewards card and offset the fee.
But overall, only a select few are even taking advantages of all the perks that reeled them in in the first place, according to Ted Rossman, an industry analyst at CreditCards.com.
A little more than half of rewards cardholders have redeemed for cash back within the past year and another 29 percent have redeemed for gift cards, CreditCards.com found. Only 13 percent of cardholders exchanged their points for merchandise and less than 10 percent traded in for a free hotel stay or airfare.
Nearly a quarter, or 22 percent, of cardholders haven't redeemed any rewards, according to CreditCards.com.
That's why cash back is often a better bet, Rossman said, even though travel rewards are still considered the best deal because they have more redemption value.
If you're in the market for a new credit card, be honest with yourself about how you plan to use the card and what you want to get from it, advised Matt Schulz, the chief industry analyst at CompareCards. For example, do you spend more money at restaurants or at grocery stores?
"The best way to make sure that you get the most out of a rewards card is to make sure that it fits your lifestyle," he said.
However, if you have any credit card debt, forget about cash back, travel perks or any other rewards, Rossman added. You need to focus on getting out of the red as quickly and cost-effectively as possible.
To that end, Rossman recommends snagging a zero-interest balance transfer offer, such as the Chase Slate, BankAmericard or American Express Everyday, which offer 15 months at 0 percent if you make the transfer within the first 60 days of opening the account.
Then, aggressively pay down your balance.
"On the Money" airs on CNBC Saturdays at 5:30 a.m. ET, or check listings for air times in local markets.
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