porting is the 2nd best bang for the buck after pipes. not everyone that is wanting their cylinders ported is gonna want a cub setup. cubs will indirectly hit the wallet harder (carbs, swingarm, clutch) more than just porting your stockers. yes, they will develop a ton more HP in most cases, but if you are wanting a mx/dune port rather than a drag port, a cub is excessive.
so, what are your needs? where you gonna ride your shee? what is your skill level? what is your budget? those are questions that you should contemplate, and then people can help you with recommendations.