I have around 100K Steam Points and at this point, other than community badges to level up my account I see no real use for it. Custom profiles are not that high of a quality, and I use my Steam Deck profile anyways.
Besides that, you can buy custom loading screens for your Steam Deck, but a third-party app has already a lot more and for free.
As nice as that would be would I believe there would way to many people trying to exploit it. Doing anything for "real world value" could end very badly.