Say, someone buys $500 worth of ETH with his BTC. Sends ETH to wherever he wants. Exchanges ETH for BTC there. How much this person will really lose in the process? I assume, it can be more than $5, but I don't know how much exactly.
For this example if we look at exchanges they become to greedy in this process. Most take to much if we send BTC but in conversion to ETH then this could be interesting. We spend something for transaction but eventually if we then this ETH convert to bitcoin again we could ended in same thing. Thing that small amount are the ones that are used most in this but when sending bigger amount think that nobody dont look into this with reason.