Because the NZ markets suffer from a massive lack of liquidity. Consider https://nzx.com/markets/NZAX/securities/BFW , it's had a grand total of one trade today, there's a very good chance that the value of those shares does not reflect the true value of the company. Or even https://nzx.com/markets/NZSX/securities/AIA , that's had 158 trades. If you can't find someone to sell your shares to then you can't invest in something else, say a new IPO, which is a major issue.
Also those IPO issues often struggle to come up with enough money to finance them, thus less companies go public. Restricting them from access to greater funds, and not allowing them to make that jump to becoming large companies.
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