There's a(nother) strategy that I'm currently testing and gives good results in backtests.
A problem with backtests is that you're wondering: is the data real or just a sampling error? So I implemented it on live data.. so far it holds to some degree.
In backtests I scan over 1000 stocks, in live data I scanned about 100. Will probably need to scale up and scan more. Got a few trigger conditions, which is encouraging, but I would have hoped for more of an edge. I set up a minimum edge (as from backtests) and got a few hits, but if I check the logs, some time later I would have got a bigger edge. So there's always the balance between setting too much margin and never getting a trigger, or too low and getting losing trades.
Anywayza, it looks good enough so far. If it holds allright, I will consider selling it to the professional segment. If not so great, this would be a candidate for selling to retail.
And here you can see the limitations of selling strategies to retail. There is real edge there but... either too small for the big money to be interested in it, or it's just too risky.
But for the retail segment it might not be such a bad idea to purchase a trading strategy as long as it works.
Question is how to price such a strategy? And again, if you sell it, it can quickly become history.