Most of the time it is not how profitable a system is that makes it compatible with the trader. It is the characteristics of a system that determine if a trader can trade that at all.
Many commercial systems are very profitable over the long run, say, 90% of the time every 24 months period is profitable, but for most beginners, they are just not prepared (both mentally and financially) to handle trading systems that having 6 months or more under the water.
For systems that perform well (spell consistency here) at a much shorter time frame, say, 95% of the time profitable every 3 months period, then you need a much higher # of trades and higher winning % to maintain the cost of having more trades. You will not likely find retail systems doing that because most of the time when someone go buying trading systems, they are looking for less amount of work.
So take some time to design your own, or modify from well known concepts so that you can get something that fit your personality - thats probably the most important thing that is needed for someone to trade a system successfully.