In my personal experience this effect has much more to do with expectations than compensation.
As soon as it's my job to work on something, and there are deadlines and expectations looming, all of a sudden I'm more interested in every other side project I've ignored for the past several years.
But in this case, there's no expectations set, pre-approval process (after which you'd be expected to meet your goals), or anything like that. If you find yourself affected by the extrinsic motivation, you can simply not log the work afterward, and then it's like you weren't offered any money for it in the first place.
As soon as it's my job to work on something, and there are deadlines and expectations looming, all of a sudden I'm more interested in every other side project I've ignored for the past several years.
But in this case, there's no expectations set, pre-approval process (after which you'd be expected to meet your goals), or anything like that. If you find yourself affected by the extrinsic motivation, you can simply not log the work afterward, and then it's like you weren't offered any money for it in the first place.