Well here is the main problem with trying to do that. You would have a bunch of plain leaf mixed with some 50x leaf. Just by mixing the leaf together doesn't mean you are changing the multiplier really. You still have plain leaf and 50x leaf mixed together in one batch. It would be very difficult to get a true "10x" hit from that. Using your mix in a bowl, some hits might be the equivalent of 1x to 5x and others may get closer to 20x or 30x depending on how much of the 50x got burned up in that hit. To truly change the multiplier you would have to pull the Salvinorin A out of the 50x leaf and then put it back into more of your plain leaf to dilute it down to 10x.
There is another problem however. If you are not measuring out the Salvinorin A then you are making unstandardized extract which can vary in strength and be all over the map for potency. Have a look at these two posts:
http://www.salviasource.org/forum/experiencing-salvia/reliability-of-extract-potency-labels/0/http://www.salviasource.org/forum/research/hplc-quantification-of-salvinorin-a-from-tissues-of-salvia-divinorum/0/As you can see each plant can also vary greatly in the potency of Salvinorin A in the leaves and the unstandardized extracts are usually not what they actually claim to be. This is probably why your friend didn't feel much from the Purple Sticky 20x. It's also why unstandardized extracts can vary greatly in the amount of Salvinorin A per gram of leaf. Remember too that Salvinorin A degrades in UV light so if these packages are not light proof that will also diminish the potency if they are stored where light can get to them.
Personally your best bet is to always buy standardized extract or get a very accurate scale and make your own.
JARG
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