If they're truly that adverse to group content but want to do endgame flashpoints then they can just buy the 61/63 grade gear off the GTN and then solo pretty much every Tier 1 HM FP.
Right again, but most solo players probably don't have the credits to do this either. From what I'm gathering from most solo players they hate grinding so I doubt they've earned the credits from doing dailies enough. Just my guess. There could be some that have the credz, but I'm guessing most don't.