How do you know "Most Larries are serial tinhatters"? Do you have evidence, or is that just in your opinion?
http://thelarrative.tumblr.com/search/serial+tinhatting
You can see them go from one tinhat ship to another or attempt to find as many as possible.
I always remember when a Big Larrie was getting tired of the fandom at one point a few years back and asked for any recommendations for other ships like Larrie to get into - ships where people believe these two people are secretly together but that it’s denied publicly. They didn’t ask for other TV shows or movies or book fandoms to get into, or even fandoms of out gay celebrities so they could support them and their relationships, but they wanted another tinhat ship to obsess over. Because what they care about is it being forbidden and denied and being able to claim they know secrets about these two men that others don’t. They fetishize that.
Many Big Larries come from having tinhatted other ships previously and many Big Larries move in to trying to create new tinhat ships to obsess over. That’s what shipping to them is, trying to find as many men as possible they believe are secretly dating so they can wank to it and then claim they’re just there to help support them.