There are so many factors that go into earnings.
If one trader has a full time job, house paid off and investable cash of $250,000 and makes $2,000 for the month, that's nice but no big accomplishment. He's relaxed and +2,000 or -2,000 no big deal.
Another trader has no job, only $2,500 in his account and bills to pay at the end of the month. If he makes $2,000 that is quite an accomplishment. He is under pressure a +2,000 or -2,000 is a big deal.
So that is about context.
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Then there is experience, skill, and consistency.
Two traders of similar situation and both trading the same instrument with the same capital (both $20,000 and both ES), but one is brand new (trader N) and the other has knowledge and experience (trader E). The new trader has a lucky streak and makes $2,000 - no analysis, no trading plan, no stops.
The other, trader E has a solid setup with a edge follows his plan, filters his trades and has solid analysis and a logically positioned stop. He too makes $2,000.
Both made $2,000. The odds that trader E will perform similarly next month are good and for trader N it is "spin the wheel".
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Then there is ego, vanity and envy.
An experienced trader may not post his results because on a good month it may create jealousy or envy in others. This can cause them to abandon their plans and try to copy him, or depress themselves because "he's making money why aren't I?', or take reckless gambles.
An experienced trader may not post his results because on a bad month, because he knows from experience that it invites, ridicule or "helpful" advice, or being thought less of - just when he needs to remind himself of that his plan is solid and that he shouldn't doubt it or himself.
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It's very hard to see any value in posting results. One of the few cases would be if every trader was only posting sim trades, before the trade or right at the trade time, on the same instrument and sharing their targets, stops, reasons for the trade and the posting was done with the goal of helping each other become better traders.
In most forums I have noticed boasting, snide comments, superficial discussion, envy, and immature emotional framework and lack of any sincere effort to work together to help each other become better.
If you could start a forum where people were not allowed to post anything but helpful and positive comments and where new ideas could be expressed without ridicule by the resident trolls - then you could create a place where traders looked forward to going and posting.
I have yet to find one of these!
Good trading to all!
It's not "all about the money"