Earring of the month club?

I've been toying with doing an Earring of the Month Club subscription... a three, six, nine, and one year options, starting in January. It would be tiered pricing, with special incentives for the longer subscriptions (coupons, discounts, etc). Somewhere between $15 - $25 / month, including shipping. Obviously, these earrings would not be for sale anywhere else on my site, and would be exclusive to members only. Glass, semi-precious, precious stones.

I'm pondering metals. Whether the subscription should be a mixed bag of metals, or if I should offer a sterling-only option.

Hence, a poll.

Poll #1314212 Earring Of The Month Club

Open to: All, detailed results viewable to: None. Participants: 34

Metals?

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Sterling silver only

9(28.1%)

Sterling & 14k goldfilled only

5(15.6%)

Sterling, gold, brass, copper, gunmetal

18(56.2%)

Comments?

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Danke.