MLM is becoming a serious competition to classic business. High quality products can be bought for less.
There are so many myths it's crazy. People still saying the products are overpriced when it's easy to check. Many people did comparisons tests to show the difference.
The myth is so popular I also thought it's true.
Your example in the UK is an exception. Again, it's pretty clear that Amway lowered prices and outlawed tools in the UK to avoid the bad press of getting kicked out.
But MLM in general, has to charge a lot more because the distributor's bonus is built into the cost of the product. Thus if Amway pays approximately 32% of the gross in bonuses, that means their product is marked up at least 32+% because Amway must also make a profit.
That kind of percentage is fairly high for household consumable products. And Amway partner store's products are priced even higher. Yes, you might find a deal or two here and there but generally, these products will almost always be priced higher than local retailers.