I believe this is already the default with the board sponsor - most of our buys were through them. Their standard purchase contract seems to explicitly say they will take the risk and cover any lost points. In a case like this, it's a huge plus.
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The first time I worked with a different broker there was no penalty listed at all, and we had to add it in manually, but they wanted the seller to pay it - that deal fell through anyway because we ended up buying VGF direct. With some other smaller brokers I also saw the seller was required to pay the penalty, and when I asked them to change it they refused. I assume most practical lawyers would not let them do it, or they are too small to take the risk. Unless all buyers start asking for this, they would probably prefer to let you walk rather than take the risk themselves.