I agree with you Chris. An offer of $5000 to $7500 cash is a great alternative, as long as the prize to be offered was already being paid for by the show and not sponsored. My only fear with hearing the idea that cash will be used in some of these game as the big prize is that rather than "substituting" a cash equivalent amount (of the paid for, not retail value), they will instead over inflate it to $10,000 because "it sounds and looks better", "$5000 looks cheap", etc. reasons, which in turn will defeat the whole purpose of offering the cash and cause them even more budget problems than already exist.
Which brings me to one weird thing- why are so many of the IUFB's not sponsored, yet when they get to a game it is a sponsored prize? Since they know the IUFB is a DEFINITE giveaway, it would seem to me to help the budget by making sure it's always sponsored and, as a result, at a much reduced cost (if any). That way, the "risk" factor for non-sponsored (paid for) items drops. Just a thought...