This was brought up when Flocker won EVO as well. A lot people said that Flocker just isn't the type of player who would get a sponsorship because he isn't really active on social media and doesn't really have much of a persona to him. He doesn't really make an effort to promote himself.
So yeah simply winning doesn't guarantee you a sponsorship, you have to bring that extra flavor to the table. ChrisG despite being so dominant for so long really struggled to hold down sponsorships because of this. His most recent sponsorship is probably the one he has held on to the most and not surprising because he has had a major attitude change in himself recently. People have actually stopped actively rooting against (majority at least).
So yeah simply winning doesn't guarantee you a sponsorship, you have to bring that extra flavor to the table. ChrisG despite being so dominant for so long really struggled to hold down sponsorships because of this. His most recent sponsorship is probably the one he has held on to the most and not surprising because he has had a major attitude change in himself recently. People have actually stopped actively rooting against (majority at least).