S&P Game has been around since they changed the rules in 1988 and grew stronger in the 90's as huge amounts of money became indexed. By the mid 90's the first research papers started popping up in all the financial journals and that is when and why I became a trader. I made millions out of thin air in my mid 20's. Just amazing. Now it is more of a gaming the gamers game, ha! and most of the opportunities are smaller or lie in obscure data that will allow you to buy the small daily or quarterly rebals before they are announced on index alert. Russell rebal has seen significant declines in profitability also. I have traded adds/deletes in many countries/indices with success and although there is significant opportunity in some markets/indices, the competition is tightening everywhere. Soon someone will be selling the system or writing a book about it and then you will know it has become as shitty as pairs trading, which cracks me up because it worked great in the 80's and early 90's when not everyone had the technology to analyze thousands of stocks and then trade large baskets. In my opinion, you are looking at the tail end of the S&P game. I put my money where my mouth is in 2003 and moved on to greener pastures (developed/found a new strategy by combing the financial jopurnals which I have been reading avidly).