> Once I reach 10K in yearly EU sales I am supposed to either register an office in each country where I do business to file and pay taxes there, which is crazy

> Once I reach 10K in yearly EU sales I am supposed to either register an office in each country where I do business to file and pay taxes there, which is crazy at a tiny scale like mine, or register for VAT "MOSS" which allows me to collect tax in the different rates depending on the countries, but still only pay the collected tax to Finland. Sounds accurate to me. This only covers the EU as well and not other countries (assuming you want to sell worldwide), and the rules are always changing too (I'm in the UK and Brexit just happened!).