I think the biggest issue for me when buying apps or paying for them is that if I decide to jump ship and go with something that is NOT Samsung (yeah, I know... **GASP**), I don't want to have to buy them again. I DO have someone non-Sammy devices and like to be able to re-download those apps/games on them, so I pay for things on the PlayStore only.
Now, there IS the exception of the Galaxy Watch stuff, but the only things I really pay for there are Watch Faces. I have seen some REALLY cool watches come out lately that are not Samsung, but I think overall, the Galaxy Series Watches are the only ones I am going to stick with, well, for now.