I don't really know anything about either of these artists, but there's two rules of thumb that I think apply here. One, your actual costs will always be higher than the theoretical minimum you can come up with doing rough/preliminary estimates. And two - the more money you have, the more money everything costs.
Also worth reading:
http://www.kickstarter.com/projects...the-new-record-art-book-and-tour/posts/232020 Again, she claims that her cds cost $15 each to press and ship. Cost. That is a lie, and an insane one at that. Let's look at an 8 panel digipack, quantity of 5000 (remember she's sold 7000 and price usually goes down with quantity) at
http://www.oasiscd.com/products/digipak-8pan.asp No options will get you over $2 each. There is no way the cds cost $15 each.
Plus the cost of shipping thousands of CDs from the replicator to your house, and padded envelopes to ship them to the recipients, and postage for each one, etc. Those $2 digipacks will easily run you $5-6 each by the time they get to the final recipient - and we haven't even talked about packaging and addressing each one for shipping.
If you only raised $25-30k in your kickstarter than you maybe have a few hundred dollars left over at this point to buy some pizza and beer, invite a bunch of friends over, and have an envelope stuffing party.
If you raised $1 million+ then your friends aren't likely to be as willing to chip in their time for free, so you either pay them to do it or hire professionals.
Also figuring all of this out and coordinating it takes time. If you have no money you do it all yourself, and don't count it as a cost. But if you have money then you have a choice - spend the time to become a fulfillment expert, or spend your time being a musician and spend your money hiring someone else to do it. Paying people for their time will eat up money faster than anything else - and once you have some money behind your project everyone expects to be (and rightfully should be) paid for their time.
So now you're probably paying $8-9 per disc by the time everything's accounted for - and that's just for a basic digipack. From the kickstarter:
{BACKER-EXCLUSIVE LIMITED EDITION CD} beautifully packaged backer-only version of the CD in a hardbound case. includes a 24 page art booklet. PLUS deluxe digital download & thank-you card.
Hard to say without seeing what the finished product looks like, but from the description I'd guess it's a digibook, not a digipack - and I can't even find a place that will give an online quote for those. I wouldn't be surprised if the base cost for the replication was over $5 a disc. So, considering all the other costs, and that the packaging may be more than just bubble mailers, plus whatever the 'thank you cards' cost, is $15 a disc high? Barely - and I don't find it that unreasonable considering it's a "back-of-the-napkin costs" estimate and not a complete, detailed breakdown.