The website is for free for three reasons:
1) We would like everyone to have opportunities to learn the easy way.
2) It's a hobby, we do it for fun, and expect nothing in return :)
3) We are handsomly rewarded when we provide BI consulting services, so it's simply not worth it (too high risk, too stressful, not fun ;p).
Can I support you?
It would be great to get paid for doing a hobby, and do it full time, so we have become Patron for those who would like to support our efforts on a monthly basis, this helps us to spend more time every week, and maybe one day we will do it full time :)
Katie & Emil