I don't see singing gram now after i started getting gigs. Basically as soon as I started getting gigs, the grams dissappear (but that might be because every day i have something).
And just hit level 10 at the events center (where you see a ton of sims, but in reality those are background people, only a few sims is in the audience
i.e. it's animation not actual sims you can interact.
Now i think it'll average around 7000 simoleans a gig - not bad per day but definitely not that great compare to gardening and growing fish on omni plants, or even guitar (if you're nuts enough to get the number of performances high) tips.
I should hav eadded the charming trait - probably would help with the case.
But, basically, once you get good, you'll start to get "regular gigs". I.e. you'll be at certain place to play at certain times.
Funny, this game is the first one where i saw a sim die from fire. Married another townie when i started (thought she'd be a good utility s9im but then she ended up being a singer) - she went out and did a sing-a-gram and then she caught on fire - didn't know what to do for a bit and tried to get her to the swimming pool - she died... sad
now i have Lanya which is a bookworm/writer. They aren't that compatible though (Romance takes an entire day lol). But that's probably because my sim didn't have the charming trait.
It has: Virtuoso, Artistic, Ambitious, Diva and Natural Born Performer. I think next time i'll drop the Diva (kinda useless i think).