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Downside to temporarily lowering interest rates?
This bit of marketing, like the zero-percent introductory rates some banks offer, is intended to make you more willing to carry a balance, and they're hoping you'll continue that bad habit after the rate goes back up. If you don't think you'll be tempted by the lower rate, yhere's no reason not to accept (unless there's something in the fine print that changes your agreement in other ways; read carefully). But as you say, there's no reason to accept ir either. I'd ignore it.