Yep, they used to but stopped doing that a long while ago.
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Are you entirely sure you "lock" the BTA price by buying in? As far as I can tell, it still fluxuates regardless of whether you've bought in or not.
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The BTA fluctuates on the main page, but when you go to increase your order amount, the BTA that you, personally have to pay to get that tier is the same as it was when you first bought it.
Source: personal experience.
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