Treasury size and loyalty

[Martok]

Ah yes, this makes much sense Martok. Why would a soldier stay if he isn't getting paid anything? lol.

Indeed. Most of these blokes don't fight solely because of patriotism or loyalty to their liege lord (i.e., you); earning coin is most certainly one of their primary motivations.

Could that perhaps be a factor in the cause of those pesky civil wars?

I don't know that it really causes civil wars per se. However, it could easily aggravate any....domestic problems you may be experiencing.