I have a feeling I've gotten it around maybe 3 or 4 times? I remember the first time I got it was at a giveaway I co-owned and I was so excited that I almost forgot to click it! I use to look on every ounch of the site for a jackpot, now I don't really look as much because it just doesn't cross my mind, to be honest.
I've gotten four jackpots in total, though only three have been official. The first jackpot I got was during one of the early trial periods of the treasure hunting system on the site. They were testing the frequency of the ads, and the jackpot ads at this point were pretty common. So common that they were sometimes being claimed when the jackpot had even less than 10,000 bells. My jackpot was over 10,000 bells, but Jader ended up turning all jackpots claimed during that time into just 10,000 bell claims, to be fair. In the end, I think everybody's bells got reset after that trial period anyways.
As for my three official jackpots, I don't remember how much each of them gave me individually, but I know in total, I've earned 141,540 bells from claiming these three jackpots.
Crossing animals since 2003.