Real profit percentages are effected by many things:
Trading Asia, Europe, the US Market... or 2 of the three. Or three of the three.
Trading for 4 hours a day. 8 hours a day. And which part of the day.
Trading equities or futures.
Wins vs Loss ratios.
Win sizes vs Loss sizes.
These are just some things off the top of my head: A person who trades from 9 to noon eastern time who can consistently make .5% per week, 2% per month, trading a 100K account makes $24,000 per year. Very nice pay for 3 hours a day.
Another person could trade 18 hours a day, participate in all three major world markets, and make 10% a week; then lose 10% the next week, over and over. At the end of the year they'll have a profit of zero.
Part of this is personality driver - people who are driven by the excitement of trading, who have a gambler's need, they will trade often and likely have large ups and large down days.
Others may have wins on 8 out of 10 trades, scratching out small profits over and over and over.
Of the people I've met over the years I think most beginners trade too much and too often. We all want to be millionaires, and we all want that million dollars ASAP.
For me, I "blew up" my account 5 times as I was establishing myself. I was trying too hard to achieve success because I wanted my trading money to be used for bills, etc. I finally achieved long term success by changing my expectations. I began limiting myself to my three best set ups. Only those three. If it isn't one of those three I don't make a trade. It's boring, but I consistently make money. It was a psychological answer I needed to achieve consistent profits - not better set ups.
My account is growing, and I know before long I will have a large enough account to walk away from my job and my trading if I choose to.