the reasons why we are not getting swatches or previews even for the bigger bloggers is the counterfeiting. When you realize the true cost of an item, and a reproduction made in say, Shanghai in a factory which has no health requirements, or even complies personal safety, water or power requirements, the cost becomes reduced by another 60%.. so the cost is frankly silly. These sweat shop type operations can imitate any detail, except the true colour or pigmentation -- but on the outside, it looks like MAC, and it shows up like MAC to those who are not familiar with the brand. The counterfeiters are putting BIG holes in the industry's profits so that's why they have all become jealous and protective of what they show and when they show it. Timing a release is critical too.
as for returns, there will come a moment in time, when if you bought it, you got it for life -- like a house purchase. No trying on at home or I changed my mind cause my hubby had a fit stories.. the old buyer's remorse will be history.
I wouldn't have a problem with a no-return policy as long as I've had the opportunity to try the product myself.
For foundation, that means I want a sample so that I can put it on myself (the way I wear it, not sheerer or more heavily), see it in natural light, make sure it isn't going to oxidize on me or break me out, see how it holds up over the course of a day, etc. That's easily done with MAC, Clinique or Sephora brands.
For colour products, I want to be able to try it on and then go outside and see it in natural light. That's what I do with most other brands but can't always do with MAC. I don't return very much from MAC (last item was Instigator) and would return even less if I could try it on. If MAC changes their policy to no longer allow returns but increases inventory to a reasonable level so that I can try before buying, I have no problem with that. If they maintain the same really low levels (often 3 to my local counter, which means I have to buy online to have a chance of getting many items) and don't allow returns, then I simply will buy other brands. I'm not willing to play roulette with my money because they like to play the hype/LE game.
I've shifted away from MAC on many categories (foundation, blush, eyeliners, setting powders, even eyeshadow) so I'm mainly buying lipstick and the odd EDSF/MSF from them at this point. I love MAC lipstick and easily BTM for four of them each year. Unfortunately, they're often the first item to sell out in LE launches so if I couldn't try first or return I'd shift to other brands there as well.
I don't doubt that some people abuse return privileges; that's often what triggers change in policy.