Thanks Federer for sharing your sales info selflessly. Just ran a quick search. I believe he has a large portfolio. Don't think it matters what the exact figure is IMO. As you can see early 2019 he had more than 30K domains, in 2018 he had over 16K, also he mentioned that at times he registers thousands of names at any given time. It's possible to hit 50K real quick at such a rate. I am sure he drops hundreds each year otherwise would be much greater than 50K.