I'm not denying their ambitions at all. But you also forget right after promotion they spent over 100m and almost got relegated (in fairness should have been if not for VAR wonders). They survive and renew Jack's contract, but they can't afford to do that again. If Jack wants to go now they'd be smart to cash in and keep reinvesting into top prospects, because lets be real Grealish is good but he alone can't get them into Europe, the competition is too high and despite how shite some 'top 4-6' clubs are sometimes they usually claim those spots in table come end of season. Putting a player on 250K per week and finishing 8th or below again would be a disaster for Villa, and it's very likely it can happen again. Then they'd only have further problems, not just losses, over other players having demands, having to rush changes across the board etc.
Agree it's not same as Delph, he jumped a sinking ship. It's different but still risky. Just talking from their pov really, could still renew and see it play out well obviously. And in either case, same as majority here, I want him to join us, but if he doesn't it wouldn't be chaos, barely anyone would be arsed.