1. Colors... Just the normals are stunning... can't wait to get a few of the morphs ie Pewter Pastel...
2. Temperment, the least nippy of all the different snakes I've kept in the last 10 years.
3. Husbandry is pretty easy once you join BP.NET!
4. Having such a large friendly community to share my interests with.

Those are all I can think of currently.. but I'm sick today so... I'm sure there are more reasons.