Intrinsic vs extrinsic motivation. It's pretty common for someone building a library to do so for the utility, scratching a real itch. Not universal (people bu

Intrinsic vs extrinsic motivation. It's pretty common for someone building a library to do so for the utility, scratching a real itch. Not universal (people build libraries to be someone who built a library, too), but common. It's very common for agencies to be building client projects in order to bill for it. Sometimes there's a special alignment where the client is also primarily interested in spending an allotted budget so long as there's a plausibly adequate deliverable.