It may not pinch you in the shorter term but like Buffett quoted in his newsletter over the weekend, the commission that you pay on the mutual funds, over a time horizon of 15-20-30 years, adds up to a lot of money!
Yes that is actually the expense ratio. Over and above, even in the underlying, if a fund has higher turnover that does not even show up. In fact, a mutual fund with high turnover might be incurring costs which you will never be able to figure out. Those are ..