DT,
Anomoly's system has an average trade of $53, so you can deduct whatever slip/commish you think is appropriate. Anomoly trades with IB, so commish is $5 r/t. I dont know how his system enters the market, but it exits with a limit order, so no slippage there. Missed trades perhaps, where the system exits at the top tick and a live order didn't get filled. But I have been very pleased with limit exits on NQ. If you get your limit exit placed early, you can very frequently get filled at your limit even if the market hits your price for just a short period of time.
Market orders with NQ pay the spread of course, but unless there is a fast move going on, slippage is minimal. So add in a tick of slippage for entries and you get $38 per trade on average. That isn't very large, but then the system gives you about 3 shots per day. And more importantly, the consistency is high, so you can consider adding contracts with a little more confidence. And the equity curve over the period shown is very smooth, again multiple contracts more plausible.
I did notice that the summary page shows "Max # contracts held: 20". That doesn't seem to match the trade listings, but it is a possible red flag. You have to be careful when examining system results that you know how many contracts (i.e. how much risk) were traded. Most systems show their results with 1 contract. Then you can use your own money management method to control the trade size.
-Jeff