Have you tried the demo ???????

You have a slider to move the height extrusion value in real time ! So you can modify the extrusion height in real time, for special effects.
Yep the price is hight for one shader only !

BUT :
If you have some game in the makings and you find it alredy successfull and it will give you 5$ for each sell, believe me it's nothing to spend some 25$ or 35$

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Someone having a stable and powerfull game base, susscessfull on IndieDb for example will invest more on 3D assets , textures, or some shader to bring the level up of the game.
Or he will pay for some freelancer 3D artist to make some models for him.

All depends in that question :
Have you some solid game, gorgeous with good play and with some good popularity ?
Well i stop here caus it's a totally different subject of talking about when invest or not in 3D assets !

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Anyway it's a cool shader , less exepensive in GPU , and if someone plans a game taht would use it a lot (dunegon game walls , futurist environments , weapons and 3D assets etc ...) indeed it can be agreat deal