They're probably completing tasks 'n' such to get up there. Some tasks that I've seen gives +5,000 SG.
At first, I didn't really get it either with how some are able to get that much on the rankings as I only managed to get a little under 500 SG on some days... here and there. :/
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top 3 in rankings are making a lot of gems and i think this is impossible. look today's top3 you will see. 30k soul gems how can it be possible?? if you know how to make fast soul gems can you guys share because 30k soul gems per day shouldn't be possible