To answer my own question in title:
I am receiving current sign payments directly to casino, and I have spent some. Because why not?

What about you?
As long as we have no problem with that, why not? I could do the same thing, even though for now I am still paid in bitcoin, not directly to the casino, but if that happens, then I can do that.
But on the other hand, I also won't use all the money I earn from the campaign for gambling because, to be honest, it slightly violates the limits I currently have in terms of the amount I have to spend each week.
Therefore, I will still withdraw a portion but leave the rest in line with the limits I always set for myself—not exceeding that amount, even though the money comes from the same gambling signature campaign. Of course, the choice is up to each individual, and I certainly don't expect the entire amount I receive to be spent, because if this habit develops, it will be dangerous for me.