[tacostakohashi]

Also, no sane person is going to sign up for doing 100% of the future work for less than 100% of future revenues.

I also have a very marginal side business I want to dispose of (about the same revenue). The best model I could come up with was that I would be willing to sell it for, say, 100% of the next years revenue, 50% of the next two years revenue, etc. That way, the buyer doesn't risk paying too much (since the price is tied to revenue), and the seller is incentivized to do a reasonable handover, take care of teething issues, etc, but the buyer will also try hard to take things over completely for when the seller is no longer around.