I have visited Black Swan and Greenies, and they are beautiful and inspiring builds. Having seen them, I think I would be prepared to pay an admission fee for other similar builds. BUT, when I was a newbie and exploring the grid, I wouldn't have spent L$199 on admission - without at least knowing what I might get for the money. 199 is a lot of money trees to pick! It took me about 2 months to put RL money into SL, and longer to make money in SL (which makes the 199 more affordable). So I would suggest you need a mini "showcase" sim (maybe an Openspace or part of another Rezzable sim) to tempt people who haven't seen your builds before. You also need good marketing and word of mouth - one lesson I have learned here is that if people don't know your stuff exists, they won't come. It might be the best stuff on the grid, but unless it's marketed, people won't find it. Also, if RL sponsorship isn't forthcoming, would SL sponsorship/advertising (billboards? sponsored events?) work?