A very enticing part of selling virtual tours is the possible residual income that can be generated through hosting fees. When selling to small businesses in my local area, most of them are hesitant to sign on for anything that requires a monthly fee... next time you present hosting fees, frame it as a yearly fee. If you want to break it down a bit, offer quarterly fees. One lump sum payment sounds better/easier for a business owner than having to pay every month.