2: People spend all that real money for this? Wow
What it is is that you can purchase a month's subscription in token form, and then you can sell or trade this token to other players for goods or in game money. Since you can easily see the price of a month's sub on the game's auction house (which no doubt fluctuates all the time), this allows you to get a 'very rough estimate' of the 'real price' of ships and such destroyed.
A very, very rough estimate.
Thus, the 'estimated value' of ships destroyed in any massive battle.