The issue as I see it is that so many names are on offer here (thousands and thousands a day) that only the very best bargains are worth going after.
Why would you go for a so-so name when there will be much better value names on offer tomorrow? And there's a lot of stuff in the "for sale" threads that's not even so-so quality!
Acorn is a completely different ecosystem from the end-user market, and there's no conceivable way to draw meaningful parallels between them.
On here, people are generally going for volume: lots of quick sales, often at very low markups of regfee. Brings liquidity, pays for renewals, but unlikely to present a big payoff unless you can do it thousands of times relatively quickly. It's also not very sustainable (in that you're burning up inventory like crazy) but it has the advantage that if you've picked the right names, your costs are paid for almost immediately. Finally, it's untargetted - you're reaching an audience looking for "bargains" but not for names in any particular niche.
In the end-user market, you hang onto domains for years (potentially decades) but the payoff is 10x, 20x, 50x, 100x or more what you'd expect to get by dumping it on here. You're basically trading time and liquidity for a much larger payoff down the road. You're also reaching a highly targeted market - buyers are typing in their desired domain because of their interest in that niche, and enquiring from there.
So a domain might only be "worth" 50 pounds in the knock-down, rough-and-tumble Acorn domainer-to-domainer market yet still go on to fetch 1,500 pounds from an end-user a month from now. There's no contradiction, because the two markets have nothing at all in common. And if that domain's listed for 100 pounds on here, it won't sell!