No biggie on a "brokerage account" - every other firm would do that, unless you were buying their own in-house funds. But even then, many would still hold it in the brokerage account. Vanguard used to have separate mutual fund accounts, but they recently started transitioning to putting everything ina brokerage account when they dumped Pershing and formed their own clearing agent.
However, it is a bit of an annoyance factor to be dinged the $8. Technically, he's correct - since Vanguard is a non-profit, quasi 'credit union' (in the sense that it's not run to make a profit, but rather serve the customers), any costs they charge account holders are, in fact, "reimbursements" to the other customers. HOWEVER....I've never heard a firm charging you to open a decently sized SEP IRA. A SEP IRA isn't anything special.
And a bit of a PIA that you have to call TRP and get Vanguard on the phone at the same time, etc. Really ludicrious since you also have to get a medallion guarantee! I'm sure a Medallion Guarantee trumps any voice recording of some anonymous person saying "Yes, I'm Jane Doe at TRP and this person is closing their account".
Of course, I had my own PIA factor in opening up my solo 401k with TD AMeritrade. So there are annoyance factors everywhere you go.