The refund policy advised by the DSA is 90% of what you have purchased over the past year. If you have been in the scheme for 5 years and have thousands in stock but the last year you barely bought anything because you were thinking of leaving you will not be refunded for most of the stock you have.
If your garage is full of 5 years worth of Aloe, you are out of luck.
I believe that while it is written into the DSA code of ethics it is actually a legal thing as well. It is a law in Texas. If your MLM operates in the US, which Usborne does, then to have a seller in Texas they need to abide by the 90% law. I am not sure if they have to extend that to all countries they operate in or if the UK part is because of the DSA code. But when US MLM companies tout the 90% buyback as them being generous, they aren't, it's the law. PinkTruth have lots of information about the 90% law
The 90% will also deduct any bonuses you have made from that amount. If you have £1000 worth of eligible stock for buyback but have made £1000 in bonuses for the past year, you get nothing.
Seasonal, discounted, and special promotion items also do not count under the DSA buyback, so there are plenty of ways for the MLM to get out of paying.
With all of those get out clauses, the 90% return looks much less attractive ,as well as i'm guessing you need to pay your own postage.
I'm guessing a high proportion of people would get next to nothing under the buyback after all the exclusions have been put in place.