That's why I would never share rep. Too much of a stretch. However, if you examine it from the broad overview, "Oh yeah, I know them really well. They've worked with me on more than one occasion against (insert big bad here) and I don't mind helping them out." It would rival the likes of a guildie helping another guildie, especially if both characters are in the same guild which adds up.
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True, which is why in raids, a mage will never get a perfect piece for a paladin or a hunter, and vice versa. However, if you could share currency, you could at least craft gear from the BoP crafting materials that are simply withering away on your main/alt. It's a small step to help your alts, not the one stop shop to gear them. No different really than simply buying a bunch of 304 gear in the AH, except now you are helping yourself a bit.
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I don't recall the last time something dropped in a raid I could not use considering my spec and loot table. As far as dungeons, say hello to actually giving said item to your own alt and not watching the person who got the drop simply vendor it since they cannot use it. And, to be fair, aside from some M+15s with friends (who would trade), any other group I get into, especially LFR, no one even talks let alone trades.
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I find in SWTOR I am more likely to play alts simply because my main has the currency needed to buy the shell gear and when the "enhancements" drop, I can simply toss them into my legacy bank for said alt. I am likely not the only person discouraged playing alts since they now need to have the same ilvl as the main who would simply be sitting on items they could have shared, but instead had to vendor as useless junk.
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Absolutely not. But if I am grinding old content for mogs, and the BoP drops help my level 33 alt, they could benefit slightly from a better piece of gear to keep leveling with. Your argument is a bit hyperbolic and my idea "stopped" at the idea of sharing things that could be used, instead of vendored. If I want a boost, I will pop into the shop and buy one since Blizz would never give up on that cash cow
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It's not a lack of interest in progressing them. But once in awhile it might be nice to give them a single item that could come in handy. I am gold capped on 22 characters, so if I could stop vendoring and share with alts, it would give me more use and enjoyment of actually looting the body on my main
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And that could work too. Leave Mythic dungeon and raid gear as BoP and convert all of the things that no longer matter. Like when my mage loots a shield in Wrath or Panda content, and I have not yet collected the appearance, or maybe my alt is only level 31 and could use it. People seem to be panicked by the concept like having alts receive treats would somehow ruin their street cred playing wow. It's a game, and we are not top 1%ers. No one cares what we do, or what we've done... except us.
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I have not seen a Need vs Greed roll system since Pandaland, maybe even cata. Personal loot tables saw to that. Even in old content running with friends, there is no roll system. This is why the Trade option is still a thing.