Glad to hear it
If you buy as few as 8 trophies ($2) you will get an accountant, which will double your gold intake. Supporting the game with even as little as $2 means that Nate can keep creating content and maintaining servers, which is awesome for everyone
Regardless, next things to consider is a doctor as that again will benefit all your gladiators by saving you gold. The other option is memberships if you are still leveling all of your gladiators (2x the skill points and fight tokens kicks ass)