I really do not see what your definition of budget problem is...
It is never "oh shit I coudl not do basic arithmetic and we dont have enough money", but always "crap this costs more than expected, since it takes longer/needs more people" or "crap we dont get enough money out of it".
There are tons of stuff which can happen, which could delay their release:
- Remarking some things are just not fun (enough).
- Having more (time consuming) bugs than expected.
- Someone from the team (or their familie) getting sick.
- No one buying the game in early access. (While they would need some money to develop further).
- Someone suing them because they use the word AI or War or whatever.
- Steam deciding after theire last games, that they first have to pass steam greenlight again.
- People in the team arguing with each other about some aspects.
- Kickstarter backer (or alpha testers etc.) make more problems than expected (having to send them emails, keys, answer their questions, making updates on kickstarter etc.)
- Having to do more marketing for kickstarter, in order to get to the goal.
etc.
600$ is less than having 1 person work 1 week, and all these things above could easily cause 1 week more delay (than expected). So for me it seems absolutely unreasonable to say "yeah we don't need this 600 everything is planned out perfectly".
Edit: please people tell me what would be a budget problem than? Make an example.