I’m asking out of curiosity.
In my own case, I pay for Office 365 annually, and in the last 5 years I’ve paid for a new version upgrade to Beyond Compare (which I use on both Windows and Linux), contributions to Ubuntu, Linux Mint, FSF, the GNU Octave program (and I get the UW-Madison Engineering Dept magazines to prove it), and The Document Foundation (LibreOffice). Out of laziness I’ve also bought internal password removers for PDFs and VBA projects in Office documents so I don’t have to keep using a hex editor and multiple file open-close operations. I also pay contributions for the odd browser add-in. I average about US$300 annually.