Examples are:
- building a side project that might never get a customer
- putting hours into a design that a client might hate for some unknown personal reason that didn't come up earlier
- responding to a tenderExamples are:
- building a side project that might never get a customer
- putting hours into a design that a client might hate for some unknown personal reason that didn't come up earlier
- responding to a tenderSome things need to get done, at least short term, sure. But if that's structural, some major chances should be done.
If a side project is neither a source of learning, nor fun, nor of opportunity (and thus "it doesn't pay off", in your words) - then just don't do it and find something else.
I'm a fierce believer in intrinsic motivation. Extrinsic motivations don't hold up. You're set to give up sooner or later.
(This is to say nothing of the inherent problems with extrinsically motivated work, such as freelance work.)
Take something like Basecamp as an example. I came up as a web developer at the same time as those guys. Could've built something like that, but didn't do it then and certainly not with the same conviction. If I had, and had early adoption, I would've stuck at it and carried through - the fun aspect wouldn't have been an issue if there was early success.