But after reviewing Mark's comments... it seems safe to assume that the process that ZEN is working on shouldn't increase the costs exponentially.

That indeed is the expectaion. Any increase in cost would hopefully be more than offset with a larger incraese in selling price. But if, as mark alludded to we can get the best of both worlds - better pricing and lower costs, well, the world shall be our oyster. Given the recent news releases, it does seem to indicate the net margin could be increasing giving us even more reason to anticipate the PEA.