About this app
What is 40 King?
“People will lose money faster on exchanges for lots of reasons,” Marantelli says. “It inherently increases spend, volatility, lots of things. And you’re playing against a sharper audience than you’re playing against at the DraftKings sportsbook.”
He compares the effect with sportsbook cash-out features, which gave customers more apparent control over their bets but may also have encouraged greater spending. The crucial difference is that an exchange customer can be facing a specialist whose entire business is identifying inaccurately priced contracts.
Kendrick sees a warning in the history of betting exchanges. In their early growth phase, there was sufficient retail liquidity for numerous market makers to profit. As that retail pool weakened, the sharper firms increasingly found themselves trading against one another.
How to play 40 King
Great Britain’s gambling industry generated £17.5 billion ($23.4 billion) in gross gambling yield (GGY) during FY2026, a 4.4% increase from the previous year.
Excluding lotteries, the Gambling Commission reported that GGY rose 4.7% to £13.2 billion ($17.7 billion) between April 2025 and March 2026.
Growth was strongest online, where remote casino, betting, and bingo GGY climbed 6.9% to £8.3 billion ($11.1 billion), compared with a modest 1.1% increase across land-based sectors.
About 40 King
Personally, the journey at Calvinayre.com has been about the great people I’ve been lucky enough to work with. It’s a rare thing in the world to be able to find great people to work with. I want to thank two former bosses who encouraged me to chase my passions in this industry. AD, a former Calvinayre.com editor and T2 who took a chance on me as well.
I don’t know what I’m going to be doing next, but I know I want to stay in the casino industry. It’s an industry I always come back to and love.
Reach out anytime for a laugh, talk shop or share ideas. I can be found on Linkedin, Twitter, Facebook and Muckrack.
