I don't disagree with your argument, but I think it's fair to point out that it's based on IMO a false premise.
Again, IMO, only a chump would pay 1% on $5M. RIA sticker prices I have seen are more like 50bps on $5M and prices can be negotiable depending on what the client wants from the advisor. If you are high maintenance or need extensive support doing planning that's one thing. If you just want general support for an AA and a fairly passive investment strategy I would go for lower than 50bps. To your point, it's still a lot of money and maybe not worthwhile, but it shouldn't ever be 1% on $5M.
For a very short time in 2015 we used an RIA who charged us 45 bp for AUM. I quickly realized, thanks to this forum, that many funds were providing the RIA at XX Trust Bank a kick back of 25 to 75 bp, and the stocks they bought mirrored some fund holdings by VG VWENX. The bond funds did poorly, due to the high fees. Their "short fund" lost a lot. In short, I continue to track what was held there against our current non-managed low cost portfolios and we are far ahead of that advisers "balanced blend" using MPT. The cost point was you get a low RIA fee for millions under management (family deal), but they make that all up in funds that pay them to sell.
When I used Schwab to hold my money, I also learned they recommended funds that provided similar kick backs, its in the details of the fund fees. Some VG funds could not be held there, In all, VG is a slug but it is very transparent, so a majority is now held there.