Ok let's say you live in LA and have a meeting every Wednesday in SanFrancisco.
Somehow, by train, car, one-way ticket, whatever, you manage to get to SFO. Then you start buying tickets like this:
Oct 20-3 PM SFO/LAX - Oct 27 LAX/SFO 8 AM
Oct 27-3 PM SFO/LAX - Nov 3 LAX/SFO 8 AM
Nov 3-3 PM SFO/LAX - Nov 10 LAX/SFO 8 AM
Nov 10-3 PM SFO/LAX - Nov 17 LAX/SFO 8 AM
Is there anything wrong with this? You have a Sat stay and it is just one cheap ticket after another. No nesting, no back to back. Is there a rule that says you can fly on two different tickets on the same day?
Of course you have to buy the initial expensive one-way ticket, but overtime that will prorated to practically nothing.