It would be useful to be able to do something with orbs of heroes you don't own. Maybe another altar function?
For example I have more than 900 golden Bala orbs, but I don't have the hero. It would be useful to be able to exchange as many orbs as I want for those of another hero - probably less of them, some kind of exchange rate would have to be worked out.
Apologies if this is already a thing and I didn't find out yet