The point is that the government wants a percentage of all gross receipts in these type of sales. It will take a big chunk of the estate auctions done by your heirs.
I don't think that is true. If the assets are sold by the "estate" then the amounts will be totaled to determine the "value" of the estate. If the value of the estate is below $12.06 million, then there is no estate tax on it.
Now, if you wanted to do the sale and give the money to your heirs, then you would pay capital gains tax on any gains.
Either way, it would be prudent to consult a tax attorney.