Either they know y'all like like strong tea, lots of sardines in the can, Euro chocolate and toothpaste, big condoms etc and they like to mess with your happiness.
Or
Product differentiation is a way for products and brands to command market share based on consumer preferences.
Lipton's, the sardine canners, chocolate and toothpaste and condom makers, ect. have marketing MBAs probably that determined through focus groups etc. that the Thai market prefers weaker bag tea than other market and other manufacturers the same.
So y'all don't buy enough to count.
And have a little sympathy for Thai guys buying rubbers in the West.