because they fly random routes all over the country,
Err, not really. They dropped Tamworth WEF 14 May and they don't fly West of Essendon yet. It appears to me they don't want to go head to head with VA or QF as we know who would win that battle, anti dumping legislation or not. They pick thin routes that are not well served. Seems like a good plan to me. Then, I am a pilot so what would I know?
https://jetgo.com/flights/jetgo-flights-route-map/
As for cash, I agree with you. They have been trading for six years so they seem viable and one hopes they have cash on hand for the imminent expansion.