Gold grants are just not enough.

[Misthaven]

Was a TD6 player for a long time, and randomly found this version on steam and since I started playing is just very frustrating how I can NEVER evolve Bubblegum princess gun power bc the bloons just dont give enough gold. It's just not ballanced.

[Dagordae]

It’s completely balanced. Like every Bloons game to get the high level abilities you have to use assorted towers and items to boost your income. Rather than bananas this time around it’s various allies, equitable item, and powers.

I’m assuming you mean her jellybean ability, as her gun upgrades are very cheap.
If you are just starting out, you simply don’t have the firepower to last long enough to reach the point where you are getting several thousand a wave. Just like how in 6 it takes a long time before you can even hope to afford the t4/t5 upgrades.

[themazingness]

Get Royal Decree, use it for a few rounds until you have enough for whatever upgrades you are wanting and can cover the cash loss you get from selling her, sell her, take the upgrades you want. Sometimes I just use Royal Decree and never use her other power, or I just use it until all characters have the upgrades I want, sell her, and then do Jellybeans Have Power and Royal Promise (don't do Royal Promise before selling her or you'll lose.)

You can also use any number of economy helpers. There are loads of them.