Indeed, that plural 'S' in Clubs pretty much kills it.
Singular = A club for millionaires, referencing a unique identity for a website development. So some possibilities there.
Plural = Referencing a collective of clubs for millionaires, basically a directory.
Even the singular term isn't that great in this day and age. Far too many people hold collective wealth of over a million dollars that it isn't much of an identifier these days.
Modern private clubs are more interested in your Spend, than your wealth at this common financial level and it really isn't a marker any longer