I explained mutliple times. C-Level want to be heard, see ROI, and be given the white glove. Align your product with their strategic initiated, and present it succinctly. Most the time they're smart enough to know a value, that's why they run a division of a company. So providing support and being responsive immediately is the made factor. I've sold to Fortune 500 C Suite for years. It's a common thread at top players. Mid-Market and lower enterprise need more of facts and figures but the true top level will not be swayed unless it is their idea.