Depends on how much you play.
There is a sweet spot of being fresh max about a month after the launch: the market is getting established, tryhards are cooling down, joining a dungeon group usually involves some well geared people. But neither of these gone too far yet.
I’d level from scratch, if you are interested. Don’t expect a fresh realm (albeit feedback would be nice to help those asking about it), if you feel like you can make it, just experience the world. BC tuning is a wee bit easier compared to Classic, and most elite quests / zones are normal, thus playable. Can skip dungeons altogether.
I don’t think anyone would spit on non-boost in either of the two meanings.
Considering guild chat, opinions range from 1% extreme to the majority simply considering efficiency and fun. As for gold, I took skinning (only) and my reserves are growing nicely on that fresh character. Won’t buy a full purple BoE upon 70 but isn’t it all about the joys of progression?