Yep, that's steep. Just think football is too expensive in this country these days. Season tickets at Bayern Munich start at about £130 (albeit that is only 17 games). Single match day ticket at RB Leipzig starts at £13. (These are adult prices).
Played at Charlton last year. Looks like when he was fit (only missed a handful of games) he played most minutes. Must've been doing something right. Imagine Chelsea would be looking at a lower end Championship club for his next step.
What's there reasoning? I'd say it's pretty unlikely personally, the guy is ambitious and if he's going out on loan surely did enough to get offers slightly higher up than us.