Sponsorship does reduce some of the costs of preparing and maintaining thousands of charts, internet access, web hosting, computers, software development, bookkeeping fees, caffeine and ibuprofen.extra things for sponsored charts including updating them earlier with more data. (I ask more from commercial sponsors and do more for commercial sponsors. Email me for details.)
There are two ways to sponsor:
But to be fair to all sponsors, I acknowledge sponsors on this page, and on chart pages they've chosen to support, for a time proportional to their sponsorship.