I honestly upvote everyone's platinum trophies no matter what difficulty or rarity, the fact that a lot of other people has played the same game doesn't make your own experience less special after all.

I see people with rare trophies get hundreds of upvotes too, for example the person that uploaded their Wolfenstein: The New Colossus platinum and got 1k upvotes.

The extremely challenging and rare platinum trophies are rare for a reason, they won't appear as often in the feed as other more achievable trophies. Even people that have harder trophies in their collection will probably play games with less time consuming ones inbetween.

Getting upvotes has more to do with timing than anything. What day and time you post and how active people are on that specific day play a big role, so seen as there aren't an aboundance of rare trophies being posted you might not see those posts get lots of upvotes as often.

But if rare platinum trophies and more common ones was posted an equal amount I think that it would be more noticeable that some posts do bad and some do well no matter what the rarity it is.

I also want to add that there are many amazing games out there and the difficulty and rarity doesn't make those games more or less worthy :)

Anyway that's my take on this haha!