At least in the case I'm describing, the company already has an expensive MS SQL Server 2014 license (Core licensing) which allows for an unlimited (ok, something like 50) amount of VMs, and they already have the expensive bare metal servers, so that's not a concern, since it's a sunk cost.
All clients are already on Office 2013, so that's not a concern either.
The Sharepoint cluster probably is a concern, but that's about the only thing, I'm pretty sure it'll be cheaper than Tableau.
I wish they'd invite the CTO to a Windows 10 events and give us some giveaways :) . No local state laws, this is for an insurance company in South America btw :)
Edit: the opinions are strictly my own, I'm not involved in any decision making sadly (no Windows 10 giveaways for me :P ), etc.