Let me preface this statement with, "I could be wrong"...I've also heard that Luxilon doesn't sponsor anyone, pros included. Even they have to pay for their strings. That's the best advertisment possible. And maybe that's exactly why their strings are so expensive.
most of the top pro's get their stuff by P1, and i'm pretty sure P1 isn't sponsored, but do get strings for a lot cheaper because they buy in major bulkssLet me preface this statement with, "I could be wrong"...
I know Lux doesn't pay pro's to use their string, but I think they give some of the top pros free string.