Stay away! While there may be benefits to having some semi-formal demo space, you will find that in retail you will spend more time educating misinformed tire-kickers than you will be selling jobs. By maintaining a more appointment only availability you instantly filter out those who really aren't serious about finding a solution. In general you want to be selling the solution, and your capabilities and experience in solving problems. I would argue that the money it would take to man a small storefront and answer questions could be much better spent on some carefully directed marketing and presentation materials.

Just my 2 cents.

Mark Seaton