LIII1940,
I'm not so ignorant as to not know that the the introduction of the HST in Ontario and BC will reduce fund returns. What I said is that investors won't "feel" the effects of the tax on fees in the same that they they don't "feel" the effects of management fees already, even though the effects are there in lower fund performance. It's harder to get outraged about what you're paying when no one presents you a bill, which is probably one reason why Canadian unitholders can be so complacent. That being said, I don't see the increase in fees resulting from the HST as a reason to abandon my portfolio of low-fee index funds in favour of holding the underlying securities. Suppose the management fee on a fund is 1% per year before GST and HST. Then the after tax management fee is 1.12% (if the fund operates in BC where HST will be 7%). Of course, the effects are worse if the mandated fees on the fund are higher. That is yet one more reason to avoid high-fee funds like the plague.
You're also missing the point of what I said in the last sentence. Investors that don't have a lot of capital find it hard to achieve an optimal level of diversification if they are directly holding a portfolio of stocks and bonds. Also, transaction costs can kill investment returns almost as badly as management fees if one is making many small transactions.