Yes, but bumpmaps are custom made for normal existing textures, so I don't know whether it would be very possible, unless people give you their textures so you can bumpmap it, but nikosefs made a perfect tutorial about that so that would be a waste of money for them.
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so, selling bump map texture is about selling some expensive thing ?

like...i made a set without bump map, Price : 20K
so if i include the Bump Map much the Price would be

is it about 200K
Bumpmap aren't hard to do, there's a lot of website used to do them, so count like 1 more k.
And tbh there's only 128x128 bumpmap, and it's unpopular not a lot of people got full bumpmap.
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