I've resetted Virizion longer than anything else before (I didn't actually count by any means), I only stopped once I had a 27/31/29/31/31/31 HP-Ice one, which was as close to perfection as I could ever wish for....yet in the whole run I never even encountered it as shiny. My girlfriend however encountered it shiny, caught it, saw it was terrible, reset it and resetted again for a week or so, till the next shiny Virizion showed up, which fortunately had the desired nature and perfect IVs in the crucial stats.
I did however encounter a shiny Giratina (the only one in my whole quest for catching all legends with outstanding IVs in OR), but reset it and continued my search for a better (regular) one once I saw it's awful nature and stats xD
But... we all know the odds, or can look them up on the internet, so it's not like knowing how many SRs it took someone else will make it more likely ;D
It just tells you if someone was lucky (finding one without trying for weeks, ie anything below ~500) or unlucky (finding none despite resetting like 10K+ times).
And remember, the chance stays the same for every single reset. Resetting thousands of times already won't make it more likely on the next reset, even on the 2400th reset, it's still just as unlikely as on the 1st.