No. Read about Monte-Carlo Analysis - what does it mean.
You have 100.000 sets of 10 trades.
Confidence 50% means that half of that sets (50.000) have a MAXIMUM 70% winning trades or worse. Actually it's not statistical significant confidence. Usually takes 95% (to estimate high border of some...
It tell's that with 50% confidence (probability) u'll have 70% winners with 500points profit each and 30% losers with 500points each, so net will be 7*500-3*500 = 2000points