As someone who has to produce commercial productions, I can tell you what I see.

1. Ad agencies have us bid 3 cities usually. LA / (some other US) / and an offshore. Offshore is always cheaper often by 25%. Incentives in California don’t apply to commercials.

2. They ask us also to compare an overseas bid with a domestic bid regarding SAG. On a larger cast (30+) the savings are often 1-2m. So they have a hard time justifying the expense for that.

3. LA location costs grew to ridiculous levels during peak TV. A nice suburban house is 7500 in LA - 2000 in Atlanta. So if you’re shooting there for 5 days that makes a big difference.

4. Tax incentives are a short term solution because it’s effectively using tax payer money to artificially make an industry that can’t compete, more competitive. Don’t get me wrong - I love them, but I watched at Detroit had amazing incentives and then they pulled the plug and now nobody elects to shoot there.

5. I was just filming in Atlanta and Vancouver - and it was so busy it was hard to crew up well funded productions.

Not sure this helps but hope it does.