I think one way to look at this is from an NPV (Net Present Value) perspective. If you work on a project where your cost to implement it is $x, but the reason

I think one way to look at this is from an NPV (Net Present Value) perspective. If you work on a project where your cost to implement it is $x, but the reason you decide to undertake the project is because you think it's value is >$x+$1 and someone comes and offers you (exactly) $x+$1, but still less than you thought you would get, would it be a good sale? From a pure NPV perspective, if there were no other, better offers out there, the $x+$1 sale should be made. The thing that really happens in life is that in addition to NPV, there's this little thing called pride, and when you think something is worth more that what someone else thinks its worth, it's sometimes hard to step back and say maybe they're right and I'm wrong. Here's the thing to ask yourself: Do you think there's someone out there that will reasonably pay you more than the $x+$1 you have an offer for. If so, hold out. If not, sell.