Thought I'd chime in here, everyone's got a sob story we can related to.
In 2017, at a comic convention, I sold my GSX 1 8.5 OW/W for $1200. I remember it was just around GPA, maybe a little less accounting for any ebay fees. I can't complain since I used some of those funds at the same show to buy these:
FF 49 (graded out at CGC 7.0) still have it
Batman Adventures 12 (raw, still have it. VF/NM)
FF Annual 6 CGC 8.0 (still have it)
All in all, what I bought can't compare to the meteoric runup for the GSX, but at least these three books I bought are still hot, and worth considerably more than $1200