It seems that not all gift cards are equal when trying to pay for TER membership. Which one(s) are best - best meaning best yield?

....I've had more issues with TER than the cards but even that has been very limited.  As far as yield, I've always assumed it's dollar for dollar.  If not, I'd love to hear more.

(Search General and Newbie for "paygarden" or "monetize" or "monetization" or similar terms.
http://www.theeroticreview.com/discussion-boards/ter-general-board-12/paygarden-and-others-1003279
and many others.)
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TER used to use PayGarden.com to receive payments via anonymous GCs. **Does TER still use PayGarden?**
http://www.paygarden.com/
Here's the list of cards that PG accepts: http://www.paygarden.com/brands  
PG used to list current trade-in values for different cards but I can't find the values. Anybody?
(The cards accepted and the redemption values probably fluctuate with supply and demand.)
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There are other sites that act as intermediaries between biz and customer, but I don't know which ones are anonymous AND customers don't get to choose: the payment arrangement is set up by the biz (TER) and the monetizer (PG). Other possibilities:  
http://www.kadepay.com/post/best-sites-to-sell-gift-cards-instantly-get-paid-fast-2025
Best Sites to Sell Gift Cards Instantly & Get Paid Fast (2025)
(Some of those sites MIGHT list their payment %ages which MIGHT be a guide to the best choice to use with TER / PG.)
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In general, according the TER and PG (or other company) agreement, you link to PG from your TER account. TER hides your ID from PG and connects you anonymously to PG. You enter your GC card info. The company (PG) monetizes YOUR gift card and pays that lesser-than-full-value amount to YOUR TER account. They take a fee for that service.  
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Let's say you have a $100 Target GC. (Totally anonymous if bought with cash.)
Paygarden might give you $70 for it.  
By arrangement with TER, that $70 goes to YOUR account on TER for X days of VIP.
Paygarden now tries to sell what used to be YOUR $100 Target GC to someone else for MORE than $70.
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The conversion rates differ by brand / company. It's easier for Paygarden to resell a Target GC than some obscure brand GC so (usually) they will pay more for a Target GC than, I don't know, maybe Omaha Steaks.
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That's the model.

Well, it would be good to know which one gives us the best value.  

Apple/iTunes gift cards. I always get dollar for dollar using them.

I hope that my reply was informative even if not as helpful as you hoped. Click around PayGarden and see if you can find the redemption values list. But I'll repeat:
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http://www.kadepay.com/post/best-sites-to-sell-gift-cards-instantly-get-paid-fast-2025
Best Sites to Sell Gift Cards Instantly & Get Paid Fast (2025)
***Some of those sites MIGHT list their payment percentages*** which MIGHT be a guide to the best choice to use with TER's monetizer partner.  
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And add: Maybe some TER VIPs will post their recent GC payment experiences here or, even better, I'll suggest (on S&P) that TER start a NEW, DEDICATED thread for the posting of recent redemption values. The posts might look something like:
Date ...... Value ..GC Store.. ... Value Received
Oct 2024 $100 Target $70
Nov 2024 $80 BestBuy $60  
Nov 2024 $100 Omaha Steaks $50
Dec 2024 $100 Target $80 (Xmas season, desperate late shoppers willing to pay more so PG will pay more)
Feb 2025 $100 Target $70 (back to lower demand)
[Example values are made up! I have NO IDEA of the actual redemption values!]
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Or maybe someone else will click around the PG website and find the current redemption values page.

I've used them twice. $100 Apple gift card gives me 100 days VIP. I've tried others like Kohl's and gotten less than 90 days.

Thanks for posting the info!  
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Quarterly Membership is ~17 Brit Pounds per month = $22.80 per month.  
Quarter = 3 months = 90 days  
($22.80 / month x 3 months) = $68.40, 3 months = 90 days
($68.40)/(90 days) = $0.76 / day
$0.76 /day x 100 days = $76 for 100 days.
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So, the monetizer paid ~76% for the Apple GC. Not too bad.