Actually, LBH, as I read it, people aren't looking for a quantized point system, but a continuous one. You won't get there, of course, as we (arbitrarily) are fixing ourselves to use integers....
Celisasu,
Save yourself a bit of work and find out what your lowest increment will be and simply call it "1". In the example you state, the Command Omega would be worth 20 (200/fundamental unit 10). Small numbers are easier to get your hands around, after all. Then, you only need to establish one constant. Smaller numbers are more user-friendly, anyways.
Of course, if you want to allow people to buy individual flights, you might have some use for that deleted units digit above. Shrug. 1 point per Kotha!