I have the same logic in my mind because for me it doesn't make any sense to buy lottery tickets when you are getting it free of cost.
People have won lottery with just a single digit number and people haven't won't anything despite holding more than 50k lottery tickets.
So it doesn't really make any sense to buy lottery tickets unless you have some spare load of money which you can spend lavishly.
I'm sure every player on freebitcoin has their own strategy, one of which is to buy lottery tickets regularly to increase FREE BTC Rewards from every free roll because buying a lottery increases 20x faster than play jackpots and others, I sometimes buy it from wof results and this is not many just a few.