Typically bid contracts include a clause that says if an inspection
discovers repairs that exceed some amount (say $2,000), then you are no
longer obligated. In other words, if the buyer is willing to fix those
problems that add up to less than $2,000, you still have to buy the house.
If the buyer is not willing to fix those problems, or the problems add up to
more than $2,000 even if the buyer is willing, then you can legally walk.