Those are some good insights on promotion.

But I am not sure if sending SBD to @null is same as burning. But even if it is I think it will have the same effect as distributing it to content creators because somebody is burning the SBD means that the believe in the future of the platform and hence they are burning it for some intended output. Since SBD is burnt it will reduce the amount of SBD in circulation and hence increasing its value.

While we apply the same analogy to FIAT money it might sound weird, this might be true in Cryptocurrency world.