Does it matter? 2k a month is a full time CSR or monthly lease for a nice office. Bottom line is SIAA is good for SIAA. All the crap about fighting for the small agency is crap. I know several local agency members looking to get out of SIAA. I would think twice before joining.
Yes, I think this is a factor for many agents. Some folks (like life and health specialists) will only want a certain sized p and c book.
To answer the person's question (even though it was directed to scooter), I think I can help with this despite f150s comments tearing down financial analysis done on a spreadsheet

This does not factor in any bonus.
If you were making 570k in commissions, piib is the better deal financially as you'd be capped with their 850/mo flat fee. Compare with 2k. But, with piib, you pay that much right away your first year and ongoing....so how fast you will ramp in p and c is a big factor.
Hope that helps someone.