Most of the exchanges have a minimal trading fees of about 0.25%
I see many people discussing trading fees here and there and that how high the trading fees is.
Does 0.25% really make a huge difference if you are earning at least more than 2% ?
Fees does really matter specially if you're earning not a bit much. Imagine you are about to get home without buying anything yet, and yet here comes the fees that deducts right away then. And those fees or extra expenses reduces your portfolio growth over time. They may be seem a no big deal but just think about they add up as time goes and imagine that it is supposed to be in your portfolio, you may be having a potentially quite bigger portfolio without those fees.
Of course, if a trader has not received any results for a certain period from trading or is even worse in the red, then the situation with interest exacerbates his condition even more. But it seems to me that everything depends on the individual selection of the exchange in order to take into account not only your experience and professionalism, but also the volatility of the cryptocurrency you have chosen. I believe that taking into account some factors, undesirable losses due to interest on trade can be avoided.