Yes and he's good enough to join a club that will pay him more
Money is every footballers main priority, the same as the rest of us.
Ah the 'you don't know anything about football' adage; You enjoy telling people how little they know & yet you seem only concerned with one club. Our league has one good club, the rest are poor & the bottom half are very poor. At the end of the season Celtic will win the league by a mile with Aberdeen & Rangers 30 points behind, with little seperating them. Finishing as the best poor team 30 points behind the team who has won a poor league is no achievement.
Additionally if you think that Ryan Jack would turn down an offer of higher wages at Rangers you're in denial.