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Downside to temporarily lowering interest rates?
This is brilliant for AmEx; they make a cut off of every transaction you do, so even if you pay it off before you ever pay interest, they still may take some.  Balance transfers, on the other hand, generally have a transfer fee that locks in a percent, depending on the offer. For your own sake, it can be a good deal if you   Considering that they make some money, it makes sense why they offer people this - merchants, as you'll read from Nerd Wallet, are paying extra to use credit cards.