As I stated also above - this raise is not only observed in Latvia, Lithuania, but across eastern countries in EU as well.
You ask about the reason - how about "let's try to compensate the loses", or "let's try as a preventive action", etc.
Now - I believe they are not going to keep this long down the road. You said "if people are willing to pay", but that should really be the question - are they? We'll see. I personally will downgrade my plan, as a reaction to theirs. What is important and strange, that even with less national data, there is a lot more in roaming.
