I'd agree with Chrome on this one. There is no such thing as a good system that won't strike runs of outs. Yet that's what a lot of punters are looking for.
Another problem for system players is sticking to a system without a lot of action and often the best systems haven't much action. It might only dish out a few selections a week, be making a profit, but is being overwhelmed by the punter losing money elsewhere!

As Chome mentioned getting good prices seem to be the difference between system profit and loss.

I often wonder why many punters here get a bit precious about their system rules. No system is going to be over-run with other punter's betting money. First run of outs and they bail out. It's been said before, you can write a genuine long term winning system on the footpath outside Ranwick and it won't make a scrap of difference to prices.