Nobody buys bitcoin to sell it cheaper, so if they offer you $100k, they think it will go higher. If they offer $1m it's again going to go higher according to them.
Will you simply give it away once someone hands you $100k, or decide that it's cheap and they know more than they're willing to share?
Selling my coin will depend on my target for my investment. If any buyer offers to me up to the amount I have budgeted to sell my coin, I will sell it and make a profit. It will also depend on the individual's financial strength. Some people have so much money that they can keep their Bitcoin for a long time because they don't really need the money. Others need to sell to solve some pressing financial issues. Some need to sell their coins to pay debt, buy or build a house, pay education fees, etc. Such people will not hesitate to sell their coins immediately after they find a good selling price. In most cases, sellers don't care about what the buyer wants to do with the product. Is there any other reason for BlackRock investing in Bitcoin apart from making a profit like other investors?