Can't someone build a portfolio by doing demo trading
Usually, a demo trade is not a genuine trade. So the genuity will not be there. For me, I won't like to follow someone's demo trade.
There is difference between a demo trade and live trade, at least seriousness is part of it.
If a person knows that s/he will be able to afford $100 to trade with in the near future and if s/he starts a demo account and trades with it as well as uses it to tip other traders, what's going to be wrong there? If s/he's damn serious about his/her play money, you'll definitely see him/her achieving his/her results and not just blah-blah talks. Another thing is, there are some demo accounts which give you the exact cut-to-cut price compared to the real ones, so the price factor also gets settled here.