Hiya Mike,
I am a firm believer in the economic side of wargames, too, since I studied economics
But if you factor in the ressources it takes to take/hold Sweden and repair its ressources I am not sure if it is worth it.
The Allies can easily take Norway and use it as a staging area for an attack on Sweden, and IIRC Sweden is in range of heavy bombers from England so basically it would have to be garissioned fairly heavily (infantry with flak/fighters) and those forces will not be available for an invasion of England/Russia.
30 supplies for ressource repairs = 6 PP
28 supplies to surpress the partisans = 6 PP
1 Infantry = 2 PP and 2 pop
2 flak = 4 PP and 4 pop
Unless I forgot something you would trade 28 ressources over time against an initial investment of about 13 PP and time for building troops which will be bound there in addition to 5 more PPs over time. A discount factor (not sure if this is the porper translation) of 5% will mean a break even between the investment and the payoffs.
Now the interesting question is what a "fair" discount rate would be.
And then there is the factor of an Allied invasion of Norway->Sweden. The same could happen even if Sweden is not taken by the Axis (and as the Allies I would seriously think about this in order to prevent the Axis from getting the 2 free trade ressources), but then they would lose supplies for attacking a neutral country twice instead of once and have to assign forces for the invasion which will be lacking elsewhere.
So basically it is down to a "I don't know" for me
CharonJr