What about: Welcome to Black Swan! Black Swan is a high end virtual art gallery with an admission charge. Purchase your ticket, in the form of the watch, at the pedestal ahead. A L$199 payment allows you access to the gallery for # weeks. You will not be able to enter the gallery without the watch. Or some such. Big, bold, simple words and exclamation points get the, well, point across, and we all run through greeter spam very quickly. With less "HALT!" in the greeting, you'll have a lot of people fail to read it. But a useful, big, clear sign above the humongous watch will help catch those that miss the greeting. It's possible to communicate clearly without yelling, or pushing visitors away.