I understand the psychological element of having something others don't have and feeling special... but frankly... I think it should only be temporarily fed.
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Someone who played the hardest mode of those games, or the easiest, that experience is still yours. Doesn't matter if I did it better, or worse, you did your thing I did mine, we both enjoyed it in the end. I feel, while it is a human emotion, that the whole "neener neener" side of us is something to admit, regretfully and not pridefully, but also something that is a real feeling that a game might as well understand exists and fuel some of our negative vices (gambling, etc). But only to relatively temporary applause (ie, few and far between rewards like this, and many rewards may only be temporarily like that).
The game should focus on making 'memory' experiences by the fun of the game and not by "I got super lucky and you didn't". (So like making the edge of the mountain, where 'end game' is, harder would be fine, but also making that easier, aka more casual friendly, would be good too- even if that is more a function of time). I really don't see the point of making experiences exclusive, so long as you can ensure they're still fun and you don't mess up both styles of player's experiences by splitting yourself down the middle (if you have to pick then generally pick your majority target audience, occasionally but seldom picking the minority, but if you can pick both THEN DO BOTH BECAUSE WHHHHHHYY NOT

). Imo.. lol.