📖 HobbyMetrics Blog

Resources for Card Sellers

Guides on profit tracking, eBay comps, grading submissions, and running a smarter card business.

All Profit & P&L eBay Comps Grading Inventory Beginner Guides
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Profit & P&L
How to Track Sports Card Profit and Loss (Without Spreadsheets)
Most card sellers have no idea if they're actually making money. Between cost of goods, eBay fees, PayPal cuts, shipping, and grading costs — the math gets complicated fast. Here's how to track it properly.
HobbyMetrics Team July 23, 2026 8 min read
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eBay Comps
How to Find eBay Comps for Sports Cards (The Right Way)
Looking at raw eBay sold listings is only the start. Here's how to filter out noise, spot outliers, and pull accurate comps that actually reflect what your card will sell for.
HobbyMetrics Team July 23, 2026 7 min read
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Fees & Costs
eBay Fees for Sports Card Sellers: Complete 2026 Breakdown
eBay's fee structure is more complex than most sellers realize. Final value fees, payment processing, promoted listings — here's exactly what you're paying on every card sale.
HobbyMetrics Team July 23, 2026 6 min read
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Grading
How to Track PSA, BGS, CGC & SGC Grading Submissions
Sending cards to multiple graders — and having no system to track them — is a nightmare. Here's how to manage your grading pipeline so nothing gets lost and you always know your ROI.
HobbyMetrics Team July 23, 2026 7 min read
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Inventory
Sports Card Inventory Tracker: Why Sellers Quit Spreadsheets
Google Sheets works until it doesn't. Once you're managing hundreds of cards across multiple platforms, you need something built for card sellers — not generic spreadsheet software.
HobbyMetrics Team July 23, 2026 6 min read
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Selling Strategy
How to Price Sports Cards to Sell (Without Leaving Money on the Table)
Pricing a sports card is part data, part market read, and part timing. Here's the exact process for pricing cards to sell at the right number.
HobbyMetrics Team July 23, 2026 7 min read
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Selling Strategy
Sports Card Flipping: How to Buy Low and Sell High Consistently
Card flipping only works if you're disciplined. Here's the buy-price math, sourcing channels, and tracking habits that separate profitable flippers from the rest.
HobbyMetrics Team July 23, 2026 8 min read
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Taxes & Finance
Sports Card Taxes: What Every Seller Needs to Know in 2026
Selling cards has tax implications most hobbyists don't know about. Here's what you owe, when you owe it, and how to track everything correctly.
HobbyMetrics Team July 23, 2026 8 min read
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Selling Strategy
Best Time to Sell Sports Cards on eBay (Day, Season, and Player Timing)
Timing your listings correctly can mean 15–30% more per sale. Here's when to list, when to hold, and how to read the market calendar.
HobbyMetrics Team July 23, 2026 6 min read
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Shipping & Packaging
How to Ship Sports Cards Safely (Without Damage or Returns)
A damaged card means a return, a refund, and a bad review. Here's exactly how to package and ship cards at every value tier.
HobbyMetrics Team July 23, 2026 7 min read
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Grading
PSA vs BGS vs CGC: Which Grading Company Should You Use?
PSA, BGS, and CGC have different standards, turnaround times, and market premiums. Here's how to choose the right grader for your cards.
HobbyMetrics Team July 23, 2026 8 min read
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Business
How to Build a Sports Card Business from Scratch
Turning a card hobby into a real business takes systems, not just good deals. Here's how to structure buying, selling, and operations to scale profitably.
HobbyMetrics Team July 23, 2026 9 min read
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Platform Comparison
COMC vs eBay for Sports Card Sellers: Which Platform Is Right for You?
COMC and eBay have very different fee structures, audiences, and effort requirements. Here's how to decide which platform deserves your inventory.
HobbyMetrics Team July 23, 2026 7 min read

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