The Laine Empire had just fought two major battles, one in the desert and one in the mountains. Although they emerged victorious from both, war does cost money, doesn't it? Food, equipment, logistics—these are all substantial costs.
Because of Amberser's intervention, the Desert Dwarves had more time to retreat and were able to do so at a more leisurely pace, taking most of their wealth with them. The cities in the desert seized by the Laine people had mostly been emptied. Although Laine gained a significant number of people, for a long time to come, the desert will be a financial burden to them, not likely to become self-sufficient for another three to five years.
While one side is a bottomless pit of expenses, on the other, they're on constant guard against the orcs' counterattacks, which amounts to a state of prolonged warfare. Here they need to continuously pour in troops and supplies, which is also a state of heavy spending.
And now, to send troops to Tiflin?
