It looks like the user with id 22123 has outdone himself by collecting over 29 million lottery tickets this time. Honestly, I've always wondered what exactly motivates the users (whales) who wager so much. I doubt such users do it just for fun and hope for their luck. They probably have some special strategy that minimizes losses due to house edge and allows them to profit from both the daily leaderboards and the huge number of lottery tickets and RPs.
It's hard to say how they have acquired all those tickets. It can be through his personal wagers, but it can be also through direct purchases (each lottery ticket costs 1 satoshi) or through referrals' comission (every faucet roll by a referral guarantees 1 lottery ticket to the referrer), or it can be a mix of the 3 methods. I don't doubt some gamblers just purchase lottery tickets directly, instead of risking a lot of money wagering on multiplier or sports.