1. I choose the morphs that will get me to the combo I really desire (like my leo girl for ocelots and leo pinstripes). 2. Because morphs are just more visually appealing to have. I like having a variety of snakes that all look different, even if some might only be pets (I don't have any pet only ones but I imagine Allure won't be used all that much because I'll have mulitgene males to replace him with the following season if things go right).
When I eventually get a retic I want a snow even though it'll cost me several grand if I remember correctly. If I'm going to have a snake for 20 years or so I want it to be the color I find most appealing. :) I have no plan to ever breed retics.