If you decide to offer drapery cleaning, the machine you will want to have is "The Ultimate" made by U.S. Products (www.usproducts.com). It can clean both with water as well as with waterless solvent, which you will need to use on many drapery fabrics. It sells for about $3000.
True but that is the machine only. You will need an assortment ot tools, an exhaust fan (the fumes are deadly.
Now, I must admit I spoke with a guy at U S Producsts who did say the "MSRP is" and quoted a $ of over $4k so the implication was "But we will sell it cheaper".
I am way open to suuegtions mark. Can you link me where you found the machine?