I would say that a bad investor is a bad investor, regardless of hand registration or aftermarket.
A savvy investor will do fine with aftermarket and hand registered domains.
Here are a few of the hand registered domains that I've sold recently:
SmartSanitize.com $3300
ThePredictors.com $2400
Aphrodes.com $750
DontSpread.com $500
Identity8.com $900
AmericanCryptoCurrency.com $600
Airmail.us $1300
PapaSquad.com $300
Here are a few of the aftermarket domains I've sold recently:
Dwellit.com $3000
Ceres.us $1300
ABG.us $2500
Wrld.org $4000
Dojo.us $2600
Finds.us $700
Schedule.cc $900
AutoBid.net $400
Emotive.us $700
My point is that I personally really don't see much of a difference. My profit margins are typically better with hand registered domains.
I think there are plenty of crappy names in the aftermarket and plenty of crappy names available for hand registration. My job is to find the gems in both.