I think we have different opinions on what a successful player trading model for our club looks like, and that's fine, different opinions are allowed 😉
In my opinion, with our limited finances, we can't be spending £3.5-£5M on a player who we hope will eventually, over time, become a decent enough player to sell for a handsome profit. If we are spending that kind of money, it needs to be on players who will improve our starting 11 immediately.
The punts we need to take are on low cost, or free transfers (no matter their age, Butland would be a great example, signed on a free transfer and already receiving interest from EPL teams), develop them, then sell them on at a profit. Or, bring them through our youth development.
Recent examples would be ; Bassey, Kamara, Aribo, Patterson. Circa £50M raised on 5 players. At what outlay? Couple hundred grand?
We have had more failings than success in player trading but with the likes of Butland, Cantwell, Dio it looks like we are on track to improve. We'll never get them 100% correct, but the less the outlay, the less (finacial) impact.
I would also argue that European success, more so the domestic, will help elevate players profile and transfer value.
Its imperative that we do improve as it'll be the only way we'll get finance to buy players.