3K. zero estibot.
I think I also have a few 5 figure estibot handregs but this doesn't mean I will renew them. I dropped a high-4 estibot cctld domain and noone bought it so far. Maybe I will, again.
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If time gap allowed (multi year renewal) then my answer would be in 45K-50K range.
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I must say that such sales required luck. I mean, normally such things are not supposed to happen. If you buy many sellable domains, then this should be a more routine business with regular sales, but this is not the case. Domaining is a bumpy road. You can invest only in liquid names, and the result will be the same. (for me at least)