I'm about to take the plunge and offer my clips up for sale, but how large do they need to be?

If you have some experience in selling timelapses, do buyers prefer cropped and ready-to-use files in either 4K or HD, or is making uncropped video clips a good idea? Uncropped, in my case, since I'm shooting with a 18 MP camera, would mean something close to 5K in width and a 3:2 aspect ratio. That would make it possible for buyers to add pan/zoom-effects or crop it as they saw fit.

Is there any point in offering the files in a uncropped format or will a maximum resolution of 4K cropped to 16:9 keep the customer satisfied?

I'd used ready to use (already edited) material in 1080p and 4K.