Except that Greece has no money to ever pay back. The talk RIGHT NOW in Brussels is about the near certainty of Greece defaulting. The German 'profit' is about as real as a dotcom business plan.
Germany is bailing out Greece, not because it makes any financial sense whatsoever, but because is is an ego thing. The entire raison d'être of the EU (and Euro) was a Franco-German attempt to challenge US (and USD) domination. On both counts, the attempt failed and any fissures within the EU would be unbearable to France and Germany.
You have a superficial knowledge of the situation, allow me as a greek to know more.
If you think the reasons for the discussed bailout are the ones you mentioned, you have a lot of reading and catching up to do.