You return a profit by backing winners!

If you can't do it with level stakes then sooner or later your target betting will break your bank. Keep working on the handicapping skills until you get that right and THEN worry about how to bet them. That is the only way to make a long term profit in this game.

PS. If you cant do it with racing then have a look at some of the sports packages on this site - bookies margins on sports are much lower so it is easier to make a profit with the right information.

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"Computers can do that????" - Homer Simpson