"Clinical algorithm for diagnostics and treatment of cfs/me (CBIS)" and the other dont sound like papers to me. The $60 includes a questionaire for diagnosis. So it sounds more like a guide to diagnosis and treatment. As he is running a private health clinic then I would expect a fee for this. It would'nt be free in the UK.
I just want to point of the different red flags. It's the combination of the factors.
The diagnostic algorithm could be included in the paper. Selling a paper with a questionnaire (not validated btw) seems odd to me.
The 85 page document is free, that contains Reports 1 to 6, and can be downloaded here.
The purchasing power of a dollar is more in the Ukraine, but not that much more, as far as I can see.
The Big Mac Economic Index, which gives the dollar price of a Big Mac hamburger in different countries, is a common way to gauge the purchasing power of one dollar each country.
Using that index, we can work out that having $100 in the Ukraine would have the equivalent buying power of having around $257 in the US.
Dr Markov's total treatment costs are about $1500, which covers appointments, consultations and the preparation autovaccines to cover 2-3 years therapy. That sounds reasonable, but to someone in the Ukraine it would be the equivalent of paying nearly $4000 in the US.
I live in a country where the minimum wage is 250 USD, top doctor consultation 25 USD, Cataract surgery 300-500 USD, BIG MAC price : 3.3 USD but where electronic devices and cars are more expensive than the US. Real life is different.
The big mac index is not really representative.
You can ask about eastern europe. 100 USD is not 257 USD.