[Shin Henshin]

I mean that's also assuming everyone buying SS Den-O wants to display both Sword and Gun Form separately. I'm sure some do, but I know I don't for example. I actually like the form swap gimmick more since it lets me have both forms without needing the space for a completely separate figure in-storage or on a shelf. And since I mainly display in base form, I can keep the Gun Form parts stored until I need them for photography. I'm sure there are plenty of other collectors who look at it similarly.

Same reason I like Evol. I basically get one figure with the ability to pull off 3 forms whenever I wish. And even then you'll still have completionists that want all 3 forms on display, thus they'll buy Evol 3 times.