No logic in buying a ticket for just 1 satoshi? I don't see much of logic in keeping 1 satoshi either.
You may want to buy 1 lottery ticket just to be in the lottery. You are right. That costs you only 1 satoshi and you won't lose anything. But generally speaking, it's not a good idea to buy lottery tickets.
In the last round of weekly lottery, there were around 189 million tickets and the prize pool was around 0.256 BTC. This means that buying lottery tickets is actually like playing a game with the house edge of around 86%.
The funny thing lately in these last weeks during these last couple of months is that people with a really low number of tickets keep winning the relevant prizes of the Sunday lottery,the 1st to 4th place which hold significant amount of crypto.
I think that huge number of tickets that gets accumulated is because of the people who wager and here there are a lot who do so.Personally I only rely on the tickets I win from WoF spins daily and not buy a single one because is money not spent wisely.