Country: England
Maximin is staying at Newcastle but he is a quirky character plus we don't know what clauses he has or what he was told when signing (he might have known about the takeover).I agree with you overall, specially since those two players are exception that confirms the rule, but I think the big difference in money in the league for smaller temas is more down to wages and not much to transfer fees, personally.
Raphina and Maximin wouldn't be earning as much anywhere, really.
Last summer it was reported Raphina was engineering a move away to the top end of the table though, so even if it does come to wages you're still better off going to an Arsenal or above. Especially if you're an average player.