the choice of leverage is totally up to the trader. as per my experience I think the lower leverage doesn't cause any harm.
What's the difference from those and from 1:2000/1:5000/1:4000 ? i think that stop loss get's tight at 1:200 & what else to say, about anything above (?)
The higher the leverage, the better it is. Then you just deposit a tiny amount of money in the trading account. How many lots shall you trade? Let's talk about CME products like NQ, ES, YM .... Is the maximum lot you can trade 1 lot? 2 lots? 5 lots? 10 lots? Well. it depends on your trade plan. If your trade plan says max is 5 lots, then don't go beyond 5 lots! If your emotional control is horrific whether leverage is high or zero, you are going to exceed the 5 lots limit. You simply can't cure the emotional control problem with low leverage. If your emotional control is horrific, don't ever ever trade until you have fix your emotional control problem. So the problem is not the high leverage problem, but the inability to neutralize your negative emotions.
I think we're talking about apples and oranges. 1:500 on a non-neglectable part of your net worth is insane. A newbie is likely to want to apply a non-neglectable part of his/her net worth because of high earning potential (rather than the loss potential s/he should be concerned with). As an experienced trader who can do the math and have the discipline to follow it, you can trade 1:500 account alright by keeping a minimum of money in it representing a small portion of your net worth. Recommending it to a newbie is just asinine though.
There's no connection between leverage & tight stop loss. Stop loss depends on your analysis. The more leverage you have, the more chances to bring profit/loss.