Quote from RichardRimes:
You do need to know commish cost. To do this trade my cost would have been $500 plus $125 comsh. you mentioned that you would hold till expiration ...the probablility of %100 loss on this trade is very high. If you wanted to close this trade say for a nickle then you still have the $125 commission......so at very best there are high odds for losing $500 ( $250 for the trade and $250 in comission)
You absolutely have to take into consideration costs of trade to make any paper trading strategy anywhere near realistic.
I'm trading via tradeMonster paper account, which includes commissions in calculations. When I opened that trade, the platform showed max loss and I thought it includes commissions. Apparently it doesn't, my bad. On their website it says that cost of trading 50 two leg spreads is $50, so I suppose this is what they deducted.
At the moment, my total gain is around +$500, but account is down about -$150, which gives $650 in costs.
My positions (symbols, numbers of spreads and commission according to the website):
AAPL 1 $15
BAC 16 $20
BIDU 7 $15
C 5 $15
F 36 $50
FB 24 $50
GOOG 2 $15
IBM 4 $15
NDX 6 $15
RIMM 26 $50
SPX 50 $50
S 16 Calls $12.50
Total commissions $307, if I understand things correctly. Why the heck I'm down $650?