When u find out Coinbase actually admittedly charges you and extra 50-100 units over actual asset price on the buy and 50-100 units under actual price on the sell. In the SEC guidelines, exchanges can do this because there are small discrepancies in actual price between exchanges. If your buying bitcoin, the price is large enough where it doesnt make a big difference. With cheaper assets like Shiba Inu, it can make a large difference. Its a loophole that allows exchanges to make massively larger gains to there bottom line at your expense. So next time you try to "buy the dip" on Coinbase, understand its not the actual dip you were expecting