Hi nitelord,
You make perfect sense. You are right, in that case Vortex might sell for a FIFO loss (depending on sell factor and minimum trade). But AIM also could trade for a FIFO loss: start standard AIM, get two buys, and the next sell is for a FIFO loss. Both systems primarily AIM at LIFO gains. Obviously this bothered Matt, and he puts PC at average cost. I don't see it as a problem myself. So AIM's value is 'ideal' and Matt's value is 'real', while the PC value of Vortex is just for trading.
Regards,
Karel