Well, i know non V.S angels or "Icon" models(Kate, Angela, Naomi) who are making about US$50,000 per day of work...modeling it's still very generous with the incomes...lol
What kind of work is the model doing for US$50,000 per day? a campaign (which makes sense and may even be kinda piddly considering that models need campaigns to support them unless the shoot takes several days)? a catalog shoot? fit modeling for a designer? showroom work?
I think that you are making an important point and that is that modeling can be lucrative and while there are models who never make big money and go in debt, there are models in their early twenties who have purchased million dollar homes. Karlie isn't even 18 and wasn't it reported that she bought a place in New York? Now I have been one of the ones who have banged the drum loudly about model pay or the lack thereof, but really it is more about what kind of work the model is doing. I have yelled at my computer screen on more than one occasion when I read a comment like, "Oh her latest pictures were for catalog X, I really like her and I am really sad that her modeling career may be ending [reading between the lines, they mean high fashion modeling career]." I am yelling at my computer, "working for H&M, Neiman-Marcus or VS is why that model is still going to be on IMG's board next year and the model who shot a couple of Meisel eds and opened the McQueen show is not!"
Regarding the discussion about runway pay, of course there are exceptions, but the big designers do pay the major models to walk in their shows and I think they get paid quite well, I stated in a previous post $5,000 - 10,000 per show if you are a MDC Top 20 model, which squares with the Cat McNeil figure (again I know there are exceptions). Think about it, the runway season lasts 4-6 weeks twice a year, that is two to three months and if the model has to travel to the fashion capitals and then run up a bunch of bills while she's there: hotel bills, getting to and from the various venues, smoking and eating (well maybe not eating), etc. If they are not getting paid and paid well, then I doubt that models at Natasha, Freja and Anja's level would be devoting as much time they do to runway, instead they would be off doing catalog shoots and only do special requests for designers that they have a close relationship with and / or the ones that they think they may get a campaign from, in their cases models at their level are probably getting both money and the designer may throw in a goodie or two as a bonus.
So runway can be lucrative if you have the status and experience to get $5,000 - 10,000 per show and then rack up a lot of shows per season (40+), based on my assumption laden calculation, an established and in-demand runway model can probably get $750,000* a year from her runway work alone - note that there are not too many in that group - Anja, Iris, Freja, Natasha, Abbey, Tao (maybe, but isn't she kinda newish?), Vlada (I think that she still books a lot of shows). Also bear in mind a model's agency gets a cut and she also has to cover all her expenses. (*Calculation Note: I took $7500 (the midpoint between $5,000 - 10,000 ) and multiplied it times 100 (assumes that she walks 50 shows per season).
The bottom line is that many top models get paid well, especially if they have tapped into the commercial / catalog workstream. I am willing to bet that Sasha and Anja are probably getting paid more for their work with Gap and H&M than their work with Prada and Lanvin.