For example aluminim profile. Base price is for one meter. But if client need 2.5 meter then I can't sell this.Yes, I can put base price for 0.1 meter and then sell 25 pieces, but this is pointless. This is why this option is very good. Also I have experience when client has money but half on card and half in cash. Solution : sell bicycle in two pieces, half and half. This may seem ridiculous but both seller and client were happy.