They aren't just 'short of funds' or hurting for money.
They could borrow really deeply to run one election, like they just did. But they simply cannot do that again in the really near term. Even if they would be willing to bet the fram by borrowing enough for another spending limit election, they won't get the credit.
If the NDP needed to go into another election right now they would also need to borrow most of the money. But they are a reasonable credit risk. The Liberals are borrowing money just to run normal operations- let alone an election. I'm sure there are high rollers who would still guarantee their loans- but then they would be REALLY behind the 8 ball with Elections Canada.
So they aren't going to be able to immediately reload and run a full spending limit campaign. Period. And this is people who are already in serious orginazational dissaray, who then have to decide which 50% of a campaign they can survive without.
If that's the case, then Iggy will hold out for the best deal he can get from Harper before folding his cards.