I will be doing a charity photo shoot of pets in Feb. The customers will get their dogs groomed and will have the opportunity to have their photos done afterwords. I want to offer "on the spot printing" and also direct them to my website to purchase additional photos if they wish to purchase more. I have the chance to purchase a The HiTi 640GALA printer. Since this printer only prints 4X6 I am looking for input regarding if this size is too small to offer at 2 for $10.00. Have been shooting for 2 years and have done some parties and events but, never on site printing. Please let me know what you think.