As mentioned by most users Bitcoin Trading is really a good way to earn profit periodically, but problem with this is the investment. To get a earning, then needs to have a huge investment to get a stable price, other than which the price is unpredictable which needs more time to grab a big profile.
if you trading bitcoinn
and bitcoin price always stable you can't profit
because you buy and sell this price is same, if you want profit bitcoin price not stable, always wave bitcoin price and you can get profit
If the price of bitcoin becomes stable, earning good profit is really a hard thing, but as I mentioned in the earlier quote even if fluctuation happens with small number of bitcoin or investment making stable earning is not possible. Huge number of bitcoin or investment is required.
It doesn't really matter if you're trading with just 1BTC or 1000BTC, it's not possible to reach a stable level of income consecutively.
However, major traders on Chinese exchange can even make profit at times there barely is any volatility.
The aspect of trading with zero fees is something that helps them in a major way as it allows them to move the market in their preferred direction.
You always have bots looking to constantly place orders above your own order. This is how you can gain profits easily when you're a market mover.
In that aspect, market movers operating on Chinese exchanges with zero trading fees are able to make profits basically all the time. The amount of profit however is never the same.