1. The 3 Phases of Card Shop Growth
Phase 1: Bootstrapping on Marketplaces ($0 - $15,000/mo). When starting out, TCGplayer and eBay provide essential buyer traffic. You lack brand recognition and your primary goal is generating cash flow. Building a custom website here is premature.
Phase 2: The Friction Plateau ($15,000 - $40,000/mo). You now have steady customers and deep inventory. However, marketplace commission fees start eating 12% to 15% of your gross sales ($2,000 to $6,000/mo). Double-selling during tournaments becomes a frequent hazard. This is the exact moment to build your custom platform.
Phase 3: The Omnichannel Powerhouse ($40,000+/mo). Your website is the primary destination where repeat collectors buy with loyalty rewards and in-store pickup. TCGplayer and eBay are used purely as secondary liquidity channels with higher prices to offset fees.