HELOC credit limit - is bigger always better?

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I recently applied for an $80k HELOC to cover some of the purchase price and rehab costs of a deal I was looking at. Yesterday the bank called me and said that I qualified for up to $170k. Of the original $80k I applied for, I only planned on using $30-$40k, so I have a hard time seeing myself using anywhere close to $170k. That said, it seems like it couldn't hurt to have it available in case some crazy good deal pops up. I pressed the bank a little on if there were any downsides to simply having a larger amount of credit available even if I didn't use it. I know I will pay more interest if I use more of the credit line, but is anyone aware of any costs or drawbacks of simply having a higher limit?