VicOsaki:
help me if I'm gettzing this right:

1. You want to buy a*A RTW First Class ticket
2. You want to buy it on the price you'd pay in Germany for that ticket (which is currently DM 11999,- for a RWSTAR1)
3. You want to take advantage of the current weak DM and taking the rate of exchange into account, pay roughly 6000 USD for this ticket (which is 1000 USD cheaper than waht you'd pay in the US)

If this is your calculation, sorry, it does not work. RWSTAR1 for DM 11999 MUST start in Germany. AFAIK tickets have to be either SITI or SOTI. But your journey definitely has to originate in Germany. So as Rudi pointed out, his way of doing it is the only possible way.