There are definitely customers that are more expensive to keep than they are worth. I don't understand the calculus sometimes... Why are we burning 100 hours of

There are definitely customers that are more expensive to keep than they are worth. I don't understand the calculus sometimes... Why are we burning 100 hours of developer time for a $5000 sale? There's not a ton of upside, and you can usually tell in the first meeting when a customer is going to be that kind of a pain in the ass.