In reply to:
I have no doubt that this was a factor when Josh decided to 'lock' the base quota provided by promo-codes to the old (pre daily reduction) levels.
Yep. If he didn't do this, DH, and possibly the offerer of the code, could be in bad position when someone relied on a published code expecting quota "A", only to find that the deal had changed since the code was published. 
It's is always possible the Panel changed could have borked something, though I suspect it probably didn't impact the underlying cgi/perl code much at all... hopefully they have checked it out.
Like you, I have not encountered anyone claiming they got less quota than they bargained for when they signed up, and I have seen several that were "surprised" that they got the "old" (non-decreasing) quota.
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I view that whole thing as a bit of a tempest in a teapot anyway; by the time anyone is likely to have used their initial quota, they will have likely grown it to above the "old" initial limits anyway, 
--rlparker