When I was running our flight school, I once had a student who, after completing his PPL checkride, sneered at me "How do you like that BMW I bought for ya?"
I looked in the lot at my 150,000 mile Honda Civic, but kept the smile going. With effort. Also his imagined BMW would have been a lease-returned 128i with body damage, not the i8 or M6 his noise level and pomposity implied.
For your 11 hours of dual, I'm guessing it broke out approximately thus:
$550-ish for the CFI, split with him/her.
Of the ~$1400 left for the plane, it would have been:
appx 110 gallons of 100LL, ~$440-$550 or so for your flight. A few more bucks for oil.
and your share of:
the $700-$900/mo insurance bill for flight school cover. An owner's policy will only be about $100-$150/mo.
the $500-$600/mo payment if (god forbid) they financed the bird
the "20% rake" to the FBO if it's a leaseback
11% of the 100-hour inspection (about a grand), and 11% of the squawks found in that period (usually a few hundo, often a set of tires and brakes)
22% of the 50-hour oil change (about $150)
the $50-100/mo tiedown, or the $200-500/mo hangar
the $30-60 GPS database, if equipped
...yadda yadda. planes are bonfires you throw cash in to keep lit.
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If others flew that plane a lot this month, the owner probably pocketed a few hundred of your dollars. If not, he got consumed by insurance and fixed costs. Aircraft leasebacks are a tricky balancing act that tends to annoy everyone -- renters, FBOs, and owners, equally.
I've also noticed a strange phenomenon with pilots who buy a plane after PPL -- they don't fly as much. Removing the "drive to the checkride" pressure seems to remove a lot of flying impetus. Building a purchase plan on 150 hours/yr of flying is probably double what you may actually do. You'll likely still come out ahead at 75 hours a year, but "only just".
While I still think purchasing is a bad idea pre-checkride, owning your own bird rocks. The seat is set exactly right and exactly where you left it. You know the fuel and oil situation. You know how many hard landings the airframe has absorbed, etc etc. But it's not half of that $1,900, it's probably more like 10% when it's all totted up.
If supply of 172s is constrained in your area, getting 2-4 other partners in the plane will make your flying very very cheap indeed. Fuel and 1/3-1/5 of expenses would be an amazing configuration. Then you can get your CFI and make pilots in the thing and end up owning a flight school. The circle of life repeats
Good luck with whatever you decide.