Only from a soap-maker perspective:This must be a skin chemistry thing, because I have not found that to be the case.
If you can acquire your SV from Connaught Shaving with free shipping the economics will be much more favorable. SV is 25-26 British Pound there. A bit less for refills.MdC has been a top tier soap for almost 50 years. If you care what you're putting on your skin it's a win. If you like a soap that's extremely easy to lather it's a win. If you want to use a top tier soap that's relatively easy on the wallet it's a win. It's in my top 3 with SV and Canada Shaving Soap (a new soap, but proving to be excellent). Many people are confused about initial price vs actual price in use. These are the expenses for me using the soap daily for a year:
MdC - $45
SV - $135
Canada????
I do purchase MdC 2 at a time (directly from Martin de Candre), so that no doubt lowers the shipping cost. SV is incredibly expensive, but it's really a wonderful soap. People who use it don't complain about the price. I'm currently doing a longevity test on the Canada Shaving Soap and after over 7 months it appears to be about half gone - but that's really hard to tell. Seeing as it was $34 including shipping I suspect it will be the cheapest of the three.
As much as I love MdC, my recommendation would be to pick up a tub of Canadian Shaving Soap. I find it incredibly close to MdC in every way.