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Bile could offer something other than improved Marines, specifically. Maybe he's bringing expendable, frenzied cultists to the mix - perhaps in trade for using on other, suicide jobs a Sorcerer might not want to risk Rubricae on, or perhaps simply as sacrifices for rituals.
Or maybe he's simply got information the Sorcerer needs.
Also bear in mind that your typical Tzeentch Sorcerer has plots going on behind the scenes - their reasons for providing Bile with the Rubricae might be beyond Bile's understanding or even his caring. Maybe it already serves the Sorcerer's ends, or maybe the fact that Bile will just 'owe them a favour' is enough for now. (...not that I'd trust Bile to come through on that favour? But hey.)
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