the eurail pass is for ppl who dont live in europe as explained at:
"Anyone is eligible to purchase a pass, except for residents in the countries of Europe, the Russian Federation, Turkey, Morocco, Algeria, or Tunisia. Since rail passes are intended for NON-European residents, it is very difficult and more expensive to find an outlet to buy these passes in Europe. Most Eurail Aid offices sell them, but at a 15% higher rate."
also check out the price of point to point if u have a fair idea of where u will be travelling and compare that with the appropriate eurail pass.
and dont forget busabout (it can be cheaper)