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.
If player likes story aspects -> do most of the quests (doesn't include money maked from crafting) they make quite the load of credits before story "end".
Can't myself estimate how much because I have mailed every surplus 50k to alts. A lot.