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this is the worst way of selling you work, 6 $ really???
how much will this give you in royalties and did you really thought how your actions will do to other artists who may have spent days to design and model, if this doesn't concern you then how exactly are you using revit and pay hundreds of dollars yearly and sell your work with such low prices???
sell one model for 50 $ and that would be better than 8 unlikely sales of 6$ .