As we are doing the same test then the costs would no doubt fall in line, hopefully. I think the question being asked is what happens to the "extra" money that is raised over and above the £20k that was the initial target. Since that was set we have seen the fans raise over £43k, and the PL has donated £200k towards the playoff costs, so somewhere in all of that there is a surplus. I cannot think the club budgeted for Project Playoffs on the basis of only one game, so at an educated guess the BOD would have had a figure in their heads as to what they could afford to expend to go into the playoffs without breaking the bank. After all they have been prudent so far, so no reason for them to suddenly do a Rishi Sunak on us.
So, I would assume that if we were unfortunate enough to go out at the first hurdle any "surplus" funds would be put into the pot for next season. At the same time it will also help to fill some of the holes left in the 2019/20 budget as we lost the income from 3 home games, plus we will have little or no income form the playoff games, with them being played behind closed doors. So all in all, if we can we should push on and continue to increase the pot for Project Playoffs as one way or another it will benefit the club either in the short term or in the next season when they may be.