If my math is correct: 2.75% of $10B/yr = $275M/yr. Although they may not be charging 2.75% across whole $10B. I don't think Starbucks would pay 2.75%.
They have at least 500 employees -- figure $100k/ea loaded cost, only possible since I think a lot of those employees are not engineers. That's all of it right there.
They really need to be in the 50b/yr range to be doing well. OTOH, they will probably get there in a year or two, and I don't see their costs going up much.