Mate, if you want me to write code for you, I'm happy to charge you for only my time and release the code to all under a #FreeSoftware license. You get my effort, you get the code written to your specifications, you get to use it before anyone else even knows that it exists. That's a good deal!
Keep the code proprietary so that I can't use it elsewhere in my career? That's antisocial, and it costs a *lot* extra.
@bignose I think the principle is good but keep it matter-of-fact and let the money guide the decision:
"I'd suggest one of two options: a) [Valuable Feature] under a license where I can reuse the work and show it to others to help further my career [$price] or b) [Valuable Feature] with copyright assigned to you [$significantly larger price]."
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.