Most Fund I’s are going to be smaller funds, often $9.99MM to allow for a larger number of smaller LPs due to the $10MM threshold from the SEC. Whereas Fund II-IV are going to be considerably bigger, often hundreds of millions of dollars. So a large number of smaller funds falling off won’t make that big of a dent in the total dollars available, but may make it harder to get the smaller initial checks.
Typically $250K-500K checks as a follow on. From what I'm seeing, lots of companies are still out there raising sub-$3M pre-seeds and sub-$10M seed rounds. You might only get 1-2% of the company but you can always try to buy up in later rounds through an SPV or your next fund, which can be a marketing strategy for raising fund 2.
