I am absolutely not a fan of slabbing baseball tickets.
I prefer to keep them raw, but do store them in a ticket top loader that I label with my own game info, as I have my own system that I started years ago.
What's the point in authenticating that a ticket is to a particular date when the information is already printed on the ticket? It's beyond me due to the cost of doing this, FWIW... I would prefer to spend the money on other cool tickets or memorabilia.
My experience is that the majority of die hard ticket collectors do not slab them, but cross over collectors that are accustomed to slabbing cards are definitely into slabbing tickets as well. To each is own.
That's the great thing about collecting. The hobby offers a little something for everyone.