Why do some people like skipping quests? Even if they are fetch quests, they might contain a side-story and the usual reward/xp. It also involves exploration, possible extra goodies or NPC interaction.
It's both a role-playing thing and a ... "gaming liberation"? thing?
The amount of content in games nowadays can be pretty amazing. When there's so much stuff to do, even if most of it is pretty fun, it's wonderful to pick and choose. Maybe I'm not in the mood to go into some tomb, pal, how do you like that? There's other stuff I'd rather be doing instead. I'm probably going to get sick of this game after X number of hours anyway, and if not, maybe I'll come back later. It's just cool not to feel enslaved to the OCD of finding every cookie.
In the same vein, there's a lot of reactivity in a lot of games today, to the point where not seeing all of the content is kind of a given. It's more than just seeing the NPC finish a conversation with a happy smile or an angry frown - resolutions and whole sections of gameplay can be shut out. Games, and RPGs in particular, are "learning" that it's OK for the player to not see everything - they're being built that way specifically. The message is that I as the player have no choice but to make some decisions about what I will and will not see - and I can't even control it sometimes. Soon it may get to the point where saying "no" provides just as much content as saying "yes" ... content you wouldn't see if you said "yes". This is a wonderful thing. It means I can be honest in the game without cheating myself out of a good time.
All that's metagame. In terms of in-game fun, role-playing is important to me, not just for replay, but for the reasons I play RPGs in the first place. I love to realize a character and really act like that character would act. I'm an effete elven wizard in beautiful silk robes, who's racist against humans, and you want me to go into some dank, drippy caves to look for a stupid human teenager who got himself lost? Pass. It's a wonderful charge when I can transcend my normal gamer expectations of myself ("Cookie! Grab it, of course you want the cookie") and really commit to telling my
own story. And frequently, a good RPG will surprise me, by anticipating my lack of cooperation, and giving me meatier consequences than "no XP then".
Main quest to stop the ancient evil is always there and there's nothing urgent about it ever. In fact, it's the last thing i ever do in any of those ancient evil games.
That was one thing I loved about Mass Effect (1). Everybody was always talking about Saren and how important it was to chase down Saren and my god we'd really better get after Saren before something really bad happens. It wasn't an "ancient evil" game per se but it was a nice spin on the traditional "go kill the evil wizard ... you know, when you get around to it". They did a good job making it feel like Saren was up to bad shit all the time and that time mattered, though of course intellectually I knew I could pussyfoot around all I wanted. Ultimately I ended up ignoring about 2/3 of the game because I was so motivated to chase his ass.
I've always found humans to be the least interesting race in fantasy setting. They usually are better for every class but c'mon it's a fantasy setting.
I used to be this way back in the P&P days too. Why make a human when you can explore something more exotic? As the years wore on though, humans stopped being the least interesting and started being the most interesting. Every other race is defined by certain personality limitations: elves are usually ethereal and in touch with nature, dwarves are stoic and greedy, etc. As a result, humans are the only race where "anything goes" and I can really feel good about sculpting their personality any way I want without worrying about whether it clashes with established culture. Other races have a lot of stereotypes attached, is what I'm saying, and whether I choose to go along with those stereotypes or go against the grain, they're usually more of a hindrance than a help to making a cool character. I still play as other races all the time for contrast, but I don't find humans nearly as boring as I used to.