Michal, I always considered Betfair as the proverbial "free lunch" and so have never gotten into it, (I could easily be wrong)

Past results, well as we all know backfitting isn't really the way to go but once you have a plan that you are working; it can indicate what you are likely to expect.

As far as long winning runs are concerned, yes it does happen fairly regularly with place betting but in nearly 5 years I can tell you that I've tried every which way to improve the profit by staking plans, you name it I've tried it, and the end result was that if you took the total amount bet and divided it by the total number of selections, and applied *that* at level stakes over the same selections; the resulting level stakes POT remained the same as normal flat level stakes (though you may have increased stakes on average).