Theory Cards: Sports CardsFootball, NBA, NFL and baseball - rookies, vintage and record sales.https://www.theorycards.org.uk/en-gbMon, 05 Oct 2026 08:30:02 GMTeditor@theorycards.org.uk (Theory Cards)editor@theorycards.org.uk (Theory Cards)Copyright 2026 Theory Cards60https://www.theorycards.org.uk/images/theorycards-logo.pngTheory Cards: Sports Cardshttps://www.theorycards.org.uk/Parallels, Print Runs and Exclusive Licences: How Manufacturers Engineered Scarcity After the Card Crashhttps://www.theorycards.org.uk/manufactured-scarcity-parallels-inserts-modern-sports-cards/https://www.theorycards.org.uk/manufactured-scarcity-parallels-inserts-modern-sports-cards/Rather than comparing eras broadly, this explainer looks at the specific mechanics, parallels, numbered print runs and licensing deals, that manufacturers now use to control supply and what that means for UK collectors trying to judge genuine scarcity.Mon, 05 Oct 2026 08:30:02 GMTTheory CardsSports CardsHow the Modern Sports Card Market Differs From the Junk Wax Erahttps://www.theorycards.org.uk/modern-sports-card-market-vs-junk-wax-era/https://www.theorycards.org.uk/modern-sports-card-market-vs-junk-wax-era/The overproduction crash of the late 1980s and early 1990s still shapes how manufacturers, collectors and grading companies behave today.Fri, 02 Oct 2026 08:30:02 GMTTheory CardsSports CardsThe Most Expensive Sports Cards Ever Soldhttps://www.theorycards.org.uk/most-expensive-sports-cards-ever-sold/https://www.theorycards.org.uk/most-expensive-sports-cards-ever-sold/A £9.3m Mantle, the legendary T206 Wagner and a £3.8m LeBron - the record sales that define sports collecting.Tue, 01 Sep 2026 09:00:00 GMTTheory CardsSports CardsRookie Cards Explained: Why the First Card Commands the Premiumhttps://www.theorycards.org.uk/rookie-cards-explained/https://www.theorycards.org.uk/rookie-cards-explained/Why a player's rookie card is almost always the one collectors chase - and how to identify a true RC.Thu, 20 Aug 2026 09:00:00 GMTTheory CardsSports Cards