Subscription auto-ship for fishing tackle, line refresh + monthly mystery box on Magento?

Three subscription shapes that actually work for fishing:

• Line + leader refresh, every 90 days, brand-matched to the customer’s rod (configured at signup). Berkley Trilene, Sufix, Seaguar, P-Line. Cuts the angler’s mid-season “my line just snapped” trip to the shop.
• Monthly mystery box, $25, $45/month curated box of lures/jigs for a target species (bass, walleye, panfish, fly). The Karl’s Bait / Mystery Tackle Box model has a billion-dollar TAM and Mystery Tackle Box hit ~$50M in revenue inside 5 years.
• Fly-of-the-month, 12 hand-tied flies per shipment for a region/season (Pacific Northwest steelhead Q1, Yellowstone cutthroat Q3, etc.).

Magento integration via Aheadworks Subscriptions, Magenest Subscriptions, or PayWhirl + recurring-order extension. Subscription customers buy 3.4x more annually than one-off in the data I see, because they re-engage with PDP traffic mid-season for accessories. The retention math: 12-month subscription LTV beats single-purchase LTV inside month 4.