Depends from which country you are coming from and when you book you hotels. Estonia definitely isn't the cheapest country to visit in Europa.
Average neto salary in Estonia is about $1100 per month, so it cant be also that expensive. Depends on the products and services you have in mind.
Most Estonian service providers worth visiting have websites, so with little searching you can see weather you think Estonia expensive or not.
yes
yes
yes it is
No , the food and the alcohol are not expensive and if you travel with the bus its not expensive
yes
pretty pricey, but it worth every penny :)
In my experience hotels are somewhat expensive, but meals, public transport and museums are very reasonable.
if you go organized in a group you can afford the vacation there,but if you go with no preparation at all you may fint it expensive.
Depends quite a lot on what currency you're bringing. Generally speaking alcohol and restaurants are expensive.
Montevideo is not cheap, it's expensive for Uruguayans. For tourists is similar to prices in Europe, more expensive than the US.
London is an expensive city to visit as a tourist so you need to be quite well off to be able to make the most of your stay.
Riga.