I think most mile enthusiasts tend to overly focus on miles, and it’s not hard to see why. Premium cabins are really nice, and miles are very valuable when you use them properly.

In the chase for miles, however, I think mile enthusiasts incur a lot of costs that they are unaware of. Here are some grave mistakes I think mile chasers tend to commit.

Once you have established the value of a mile, it makes perfect sense not to buy miles at a rate higher than your valuation of it. If you value each mile at 1.5 cents, for instance, you would turn down paying a credit card annual fee of $192.60 to earn 10,000 miles since each mile would cost 1.926 cents – far more expensive than what you think it is worth.

This is clear enough, but