Wow, I just read through all 18 pages of this thread. Great work from OpenGlobal and input from other users -
well done 
I am using Vm2.0.18 & also have a test version running 2.0.22a and have ran into a problem before with multiple prices, but have managed to ignore it until now.
I have 1000's of products using Parent\Child with the stockable variants plugin
I initially wanted to use different prices for buying multiples of products - This worked great in VM1, but I have never got it to work in VM2.
It also works great for single products, but not with products using the stockable variant plugin.
When I add multiple prices to the child product, when you view these in the front end store the price always reverts back to the main parent price? My initial idea was that if a customer was buying 1 variant of the product he/she pays full price. If they buy 2-4 of them they get to buy at the discounted price and so on for other quantities 5-10, 11-20, etc
I gave up with getting this to work a long time ago
BUT,
I am now revisiting this as I need to add a different price to every product for a set shopper group.
With the help of CSVi, I have successfully imported these prices for all my products and child products, but when I test this by logging in as a member of the test shopper group, the price is ignored and always reverts to the main parent price. So I guess multiple pricing still isnt working for stockable variant plugin products?
Again this is OK for normal/single products, it just doesn't work for stockable variants.
Does anybody have any ideas on this? Is it a bug?
Thanks in advance,
Andy
PS Joomla Day UK in Ascot on 5/6th October 2013 - http://www.joomladay.co.uk