I guess I have a few thoughts on this...
a) I feel those are both 2 different situations. It seems in this case that a camp like Opulent Temple WISHES to have those artists and musicians there, instead of being solicited to through their agencies/managers because it will "look great on their tour schedule". At his heart I would hope Syd is trying to respect the artists that play there by showcasing their talent and giving them a stage to really get down and dirty- share what it is that got them into it in the first place, in it's purest form (i.e. booking them in the first place), as opposed to someone exploiting their talent for gain, either financial or career-related i.e. providing a stage simply so you can sell something and throw your logo out there, or if you're a DJ, just looking cool to some talent buyer from Jersey. Which as we all know is one of the great sins of Burning Man culture (being from Jersey, that is). I would HOPE that these artists booked are doing it because the recongize the festival as the opportunity to make a very deep and real connection with the people dancing to their set, and not just something to talk to about with that chick over there with the fake tits. And anyways if these artists are gonna blow up they gotta deliver at WAY more than just one festival, no matter how much of a "resume builder" it seems to be to have slots at Nexus, OT, Robot Heart etc. etc. etc.
b) I think that the booking and advance promoting of big name DJs is attracting more people that regard it to simply be one big rave. I will admit that I'm REALLY psyched to see some of the people I've seen on the schedules, but I would much rather just have it be a surprise... some of the best nights I've had dancing there are completely random experiences (will never forget Freeland at the Boombox in 03) and advertising that you're going to have all these huge DJs playing just makes it seem like one more southern California rave festival at a REALLY REALLY REALLY cool venue. I would LOVE IT if all sound camps just agreed to not publish their lineups... I think it would make the week more enjoyable getting constantly pleasantly surprised to learn that one of your favorite DJs is playing there.
c) $350 really isn't too bad for a week at a festival if you count the INSANE talent that is out there in such a short period of time. If people start regarding this thing to be a music festival foremost, it'll continue selling out year after year and many people will find themselves in the same situation they are now- seeing $1,000 tickets on Ebay that they're contemplating buying simply because Mimosa, Schpongle, Jamie Jones and Art Department (among DOZENS of others) are on fire right now and seeing them in this environment would (and will) be fucking RIDICULOUS. Honestly, I was floored when I found out Tiesto and Oakenfold were booked there a few years ago, simply because it seemed so... out of place.
d) Don't ever leave it up to anyone else but yourself to get you a Burning Man ticket. I really really feel for those artists and DJs that are without one right now and sincerely hope that they can figure something out, but I got myself some CDs and a ticket and I am fucking READY to git down.