I think that TER is still using paygarden.com to monetize "our" GCs into Membership payments. TER doesn't care what GC you use. And I doubt that paygarden cares about where the payments are going as long as they are legal and comply with all banking and payment laws.  
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Starbucks is no longer on the paygarden list of accepted brands:
http://www.paygarden.com/brands  
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WHY does paygarden no longer accept Starbucks? Who knows? Maybe they are worried about Starbucks declaring bankruptcy or doing something that will destroy the value of the Starbucks GCs they bought at a discount from the public, like those paying for TER VIP.  
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(E.g., let's say paygarden "bought" 1000 x $100 = $100,000 worth of GCs at a discount from "us" for, let's say, $75,000. They were hoping to SELL those GCs to the public at a discount, say $90 for a $100 GC. Net: $90,000 - $75,000 = +$15,000 on that batch of Starbucks GCs. If the market for Starbucks GCs -- full price or discounted price -- has been destroyed, paygarden is out $75,000 for a pile of worthless or "worth less" GCs.)