I don't understand. Why doesn't the amount of work required to perform all the due diligence activities not scale with the size of the company?
Um, that is something that scales.
> The cost of valuating the company, negotiating, getting board consent, etc., are all basically constant.
I don't see how that can be, though. If the company is just my friend and I, your "board consent" is just getting the two of us to say yes (assuming we are not structured as an LCC, in which case it is irrelevant). The cost of appraising a purchase is generally related to how much it is claimed to be worth. Ditto with negotiating; a higher price tag or larger organization brings more things to haggle over.
I smell people not capable of doing cost-benefit analysis.