Agreed. most of the time oil is traveling down from the top of the engine. It fools less than experienced people into thinking its a rear main when in fact is a $7 o ring pair.
Even for someone who isn't a mechanic replacing what is called the turbo pedestal o rings is not hard. I would look on youtube there are some very helpful and indepth videos. I would not buy the o rings just yet though.
common oil leak spots on 7.3l:
-Turbo to pedestal o rings (the o rings that allow oil from the engine into the turbo to lubricate the bearings)
-CCV O rings- some small o rings that allow oil vapor from the engine into the intake hose (the hose that has your air filter on the end)
-HPOP Lines and hpop end fittings-there are two lines and 4 end fittings that use a special tool to disconnect
-there are also 4 large bolts with an o ring one on each of the heads front/rear that can leak (most times its the rear by the hot exhaust pipes/up pipes)
-uncommon but happens-high pressure oil pump (HPOP) top cover gasket o ring, and various gaskets/o rings for the HPOP it self.
-oil dipstick tube adapter fitting- on lower pass side of engine oil pan. usually leaks ALOT and is somewhat difficult to replace with some aftermarket kits out there.
*there are probably a few more but those are the ones I see the most.
I have been buying o rings for powerstrokes from this website for years with great prices and quality OEM stuff.