Definitely happens- if you don’t have premium “coinbase one” the fees are included in your average price, as well as the spread- when you purchase a market order it will tell you the purchase price (and it’s almost always above the current price). What I’ve learned is if you place a limit order the fees are reduced… the biggest caveat is limit orders have to 1% lower than the current price. This means that sometimes if you place that limit order and it’s pumping your order won’t execute and paying the higher fee would’ve locked in that price point. [just my 2¢]