Given inflation, that's not really all that much. The reparations demanded from Legion at the end of GWIII was what, $700 million? Given how far the game has progressed since then, how many large nations there are today, and how much more money each nation earns, $1.7 billion isn't all that much. It just seems like it because the most recent wars to demand large reparations measured the amounts in tech.
How much tech did we ship NPO? I'll just pull 68,000 out of my $@!, I'm not sure if it's right. 68,000 tech divided by 50 tech per slot is 1,360 slots. Valuing the tech at a generous but not uncommon $1.5 million per 50 tech shipment, the total value of that reparation would be $2,040,000,000, or $2.04 billion. That's not much more than the $1.7 billion being forked over here, but it also required significantly more slots. If you place a value on the slot rather than the tech, valuing each 50 tech per slot shipment at $3,000,000, the cost doubles to $4.08 billion. This doesn't take into consideration the slots consumed in the process of shipping aid to the small nations that would have performed the bulk of the tech shipments. That included the cash value of the reparations would balloon over at least $5 billion.
That said, I'd still take this. The war necessary to attain a greater sum would be infinitely more costly considering the players involved. A wise decision by all parties involved.