Yes, this is a very old and outdated thread. There were several questions in this thread. First, how to actually set the filament cost, and then later on, questions about alternate currencies that required a cost per kg of plastic that exceeded 2 digits.
For awhile now, both of these things have been available. Click "Edit Process Settings", go to the Other tab, and you can set the filament price and filament density. The filament price supports many digits, so it will work fine with alternate currencies like SEK mentioned above.