Costco restricts its online catalog because their business model depends on getting members into physical warehouses. The in-store treasure hunt—rotating deals, seasonal items, and limited-time "roadshow" products—creates urgency and drives impulse buying that accounts for a significant portion of revenue. If everything appeared online with full availability transparency, members would cherry-pick deals without visiting stores, killing average transaction values. The website focuses on predictable categories: bulk pantry staples, electronics, tires, and high-ticket items where shipping economics work. Perishables, furniture that requires inspection, and region-specific inventory rarely show up online because Costco operates a hub-and-spoke distribution model where each warehouse carries different stock based on local demographics. Showing out-of-stock items across 600+ locations would frustrate users and expose supply chain gaps. Costco also avoids the operational nightmare of real-time inventory syncing across warehouses and web. Most retailers spend millions on unified commerce platforms; Costco deliberately underinvests in e-commerce technology because online sales carry lower margins—they pay shipping, can't upsell at checkout, and lose the hot dog combo effect. Their 2-3% operating margin leaves no room for Amazon-level logistics. From a UX perspective, this is intentional friction. Costco's website isn't designed to be comprehensive; it's designed to convert members already committed to the ecosystem. The search functionality is notoriously weak, product pages lack detailed specs, and navigation assumes you know what you want. This isn't incompetence—it's strategic neglect that funnels serious shoppers to warehouses. At Ottawa SEO, we'd never recommend this approach for clients trying to grow online revenue, but Costco isn't optimizing for digital sales. They're optimizing for membership retention and warehouse profitability. Their web presence exists to service existing members and capture overflow demand, not to compete with Amazon. The limited catalog is a feature, not a bug, protecting a physical retail model that still generates $240+ billion annually.