Bidiots - why does artist not get money purchasing your own painting

This question is about the bidiots game in the jackbox party pack.

I believe when you purchase a painting, the artist will receive half of the payment at the end of the game (and presumably the "house" takes the other half).

However, when you purchase your own painting, why is half the payment not given back to you at the end of the game? Or maybe it is, I'd like some clarity here.

Also, your painting, like anyone's else, is worth some money. If you buy your painting back for less than it's worth, shouldn't you get profit like you do if you buy someone else's painting? Or maybe you do, I'd like clarity here as well.