Even so, his point still stands. The upper range of developer salaries in Czech Republic, before taxes, is $3000 to $5000. The country is considered Central Europe.
If you go for Eastern Europe, Hungary/Poland/Ukraine, that's enough to afford the best people.
Income tax (at some bracket) is a percent of income. What does it matter if it's "5k to cover taxes" lol, it's not like its a flat expense that 5k may or may not cover.
Even 3000€ or even 2500€ take home pay per month would let me live a very good life (for me) in a sunny, safe, beautiful place in Europe. All the while I'm working for a free software project, one which I'm a fan of (not working to make my boss rich, not inventing better ways to make people click on ads). What else could I possibly ask for.
If you go for Eastern Europe, Hungary/Poland/Ukraine, that's enough to afford the best people.