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Just have a look at some of the material already for sale under the keyword "terrain" to get an idea of what you'd be up against. To answer the question, of course, it's very possible to sell 3d terrains, especially in 3dsmax native file format (most of the models sold here are for 3dsmax). Blender is also an up and coming popular file format, but .max is by far the most popular for sale. I'm not sure about Sketchup, but the more file types you can upload and provide with your product, the better the ranking will be for that product. So upload as many formats as you can. I would, however, make .max the native default to help maximize sales potential.
https://www.cgtrader.com/3d-models?keywords=terrain&suggested=1
Thank you a lot for that useful information.
