I don't feel the least bit of remorse using the gift option here. I sell quite a bit on eBay as well, and they take almost 10%, and PayPal gets its 4% for the transaction as well. PayPal is owned by eBay, so they get you coming and going.
I too have purchased and sold many items here so far on the forum (with way more purchasing lol) and so far have had excellent experiences. The members here do what any good seller would do, they describe the items accurately, communicate with the buyer, provide a tracking number, and follow up after the item is delivered.
Last but not least, in my experience, 99% of the people that backpack, hike, etc have a very high level of ethics and morality, more so than the average joe. I don't believe that is the issue here with using the gift option.