Actually the mechanism for collecting a sales tax is already in place, and very easy for businesses to comply with. It takes me no more than 15 minutes to compute my 'sales tax owed', complete the forms and write the check each quarter for my business. This is on the State level, but it would be no more complicated at the Federal level. Compare this to the time and money it takes me to fill out all the appropriate forms to collect, report and forward Federal Income Tax, Social Security Tax, Medicare Tax, distribution of W-2 forms at the end of the year, 1099's prepared etc etc and you can see why a business might be interested in the sales tax end.
Even better for you, the business owner: You get to keep a credit as compensation for the burden of being tax collector for the government.