There is another point too here and that is you can't build "
pot odds" if the money in the pot is your
own. In other words you can't
raise a lot on the
flop and then use
pot odds as a reason for calling later.
Pot odds only applies when the return on your investment isn't your
own money. That's a key point that many people miss even if they are good players. It is true that once the money leaves your
stack, it isn't considered yours anymore but you can't use that as a reason for a
pot odds call. Notice how you may for one move be
able to justify a
call based on odds even if it is your money in the pot, but if you looked
back at the entire hand and what you put in for what you could get
back, you screwed up. Individual moves
don't mean anything if overall you are playing badly and going against math.