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Maybe those credit-card rewards—airline miles, concert tickets, a new laptop—are just too tempting.
A recent survey found that almost one-third of affluent homeowners, defined as those earning at least $100,000 a year, plan to use credit cards to pay for renovation projects, according to San Diego-based LightStream, the online lending division of SunTrust Banks. Of the 3,172 respondents in the January survey, 32% said they would pay…