It depends on the person who is going to trade, if you are still a beginner in trading then better to start at small capital, get some experience first because that is the most important thing that beginners should have to be a better traders,
I really agree with this, if we are new, it is better to trade with small capital. Because we are likely to trial and error, learning by doing.
Although we have been learning at first, when it is a starting trading, we sometimes need learning by doing. And we can save our money with that small amount.
I know that some newbies will not think like this, because some of them may only think about taking big profits qucikly. But, it can't. We must be aware at first that trading may give you profits, but don't think about big profits at first or you will lose more.
And if we have been enough for learning by experience, we can increase the capital due to the times.