Forget cost for a minute. Most circuits are designed VERY carefully. You don't realise when driving a circuit that all of the corners, run off areas and so on are designed to be driven in a specific direction. The means that corners normally open out at the exit, and have run off areas and rumble strips on the exit but usally not the entrance to the corner. By driving this the wrong way, it means that the braking zone is not a straight line, and there are not sufficient run off areas.
I agree that it would be a nice idea to be able to use the circuit forwards and backwards but this would need to be considered in the original design of the circuit, and would be pretty much impossible to adapt at a later date.
At the end of the day, with most circuits, running it backwards is just too dangerous, and it is not until you try it that you realise this!!!
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