Bounty!
Michael didn't really care about Jin. After all, his step aunt and uncle are the biggest shareholders of the organizations War Temple, War Angel and War Dragons who has a hand on both light and dark of society, and they are far more powerful and scarier than Jin's father.
And if the sister of his adoptive mother is already that powerful, then what of Alice and Tom then? Certainly, they are also not ordinary people just based from that, it's just that Michael couldn't find anything about them except that they are well off, and has multiple businesses.
It's also because he couldn't use or buy some intel from 'The Continental' as they require a lot of cash, which he currently doesn't have.