You're dealing with a very specific theme so there will be demand but you will also have problems finding enough content to keep those who are only partially interested in your theme to both sign-up and then recur. I'd spice up the tour a bit (but you are going in the right direction with it), get rid of the 3 day trial and lower the monthly membership to $9.99. Once you can sell that, develop a membership base, get some feedback on what else members would like to see and then provide more content to satisfy your members' needs, then you can think about upping the monthly price and possibly including a trial.
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