Yes I am using low fees for transactions that sends a small amount of Bitcoin because I thing sepending a big fee just to send a little Bitcoin is something very weird
some exchanges are giving you option to use the transaction fee according to your own wishes but the transaction speed is depending on your transaction fee. while some exchanges have fixed amount for transaction fee and you have pay that fee in any case.
Most exchanges are now charging 0.0015 which is enough. I use that amount now. The exchange went from 10k to 20k to 50k and now 150k that is a big leap and with Bitcoin being worth more it's now well over 30x more costly then before. 100x more is not unreachable. Before it was 10k now it's 150k that's already 15x then factor in Bitcoin price and you get 30x 90x easily. Pay more then 0.0015 ntc and you looking at 100x more costly then before.