How long do you plan on doing this though? For the foreseeable future? What if it wasn't extremely successful and only a couple people bought and frequently used the cards, would you still do it for them? And why the moderated thread?
Answer these questions and I will most likely buy one.
I don't see a problem with reloading them for the foreseeable future. The less people who are doing it, the less of a burden it is right? I can promise this: I WILL notify my customers if I stop the service, so you won't be depositing money and not hearing from me.
The moderated thread just made me feel better, but on second thought, I can see how it might make buyers uncomfortable. I can make an moderated thread if it's a problem. Eventually, I plan on creating a website if there is enough demand for the service.
EDIT: I made a new un-moderated thread.
Please use new un-moderated topic: https://bitcointalksearch.org/topic/wts-fuel-cards-fuel-up-with-bitcoin-at-shell-exxon-chevron-bp-and-sunoco-879176