I think it's a cute idea and most of us do prefer to support YTers but... the only thing I would consider is are the items you would offer any different than what can be purchased through the photo dept at Walgreens, Walmart, etc? I would think as an independent small business it might be difficult to compete price-wise. I wish you the best of luck with your decision though.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226