It has a lot of factors, but as my experience reducing the trading fees is important factor to become a successful trader!
Not that much! Because on the exchanges you might pay 0.1% to 0.5% which is not too high when comparing to the how much profits we can make with cryptos in short time.
Maybe he is talking about arbitrage trading ? Becouse in regular trading I dont see the reason to be worried about it.
At
Livecoin the fees are around 0.18% - 0.02% depending on the trade size, turnover while at the Bitstamp it is always 0.5% for all traders(AFAIK). It makes sense to make an arbitrage trades at the Livecoin. A successful trader doesn't get stuck with the small costs of the trading strategy, they focus on the results of the proven track record.
For arbitrage opportunities, there are a lot of small market cap coins which can be traded between the exchanges that have a different bid/ask prices. Trading fees are not important unless the profitability of the single transaction is lower than 1%. If the last case is actual, instead of wasting time for small profit I would prefer to buy and hold for the higher profitability depending on the personal experience of the trader.