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There are about as many people holding 10k or 5k, as there are people holding 10000 or 5000 BTC. I can also tell the number, after practicing quite a lot of this in my youth: about 100 people have 10k or more, 150-200 people have 5k or more.
Thanks for an interesting guess, but I would have doubted that was correct... BTC is far more widely distributed : it has had much more time and activity, in addition to at least 3 'bubble' phases (whereas I would possibly count this month as XMRs first 'bubble'). Conclusion is that there are fewer holders of 5000 BTC than of 5000 XMR.
Please could you expand on your own reasoning ?