I would pay for an expansion or for a sequel. Also, if you had options to pay more in exchange for little bonuses (especially if those bonuses included lore stuff), I would most likely pay at one of those elevated price tiers.
If Paradox will not fund a new expansion but doesn't want to lose any potential profit from the game/its xpacs, would it potentially be possible for Paradox to give Kerberos permission to Kickstart a DLC so long as Paradox still got some (presumably/hopefully relatiively small) fraction of the proceeds?