It is not the word count but the amount of time to "round trip" the document, engineering costs from Frame to xml and back. The second part of that is the DTP. Frame does a cleaner round-trip than word so less DTP time for cleaning up the formatting.
I hope that helps. We translate into 29 languages where I work and we cut the cost by about 30 to 50% using Frame and that was before we switched to DITA. Just my .02, Beth ***************************************
