Well if 300k only gets you 2.8 mil + the squad he already has, that's nowhere near enough for the team he'll want, last year he had the PIM version of icons and the likes of Vieira were 8 million alone.
It's chump change to him anyway and goes back into content but there are plenty of people on average salaries who pump thousands in a year.
My mate works in the fraud department for Barclays and they get hundreds of calls a year about fifa point purchases (usually from idiotic parents who leave their bank details free to use on the account).