Very rarely (maybe twice a year), and I don't ask questions about the hosting package. I can find those answers myself via a search engine, and learn a couple of things in the process as well.
If there's something I can't do myself via the control panel, I would have to ask for help. So, that explains the "why".
My situation is exactly same, If it can't be done using control panel i ask support to do it for me.
only ask for support when thing goes wrong. for a 12 months period, i've contact the support 14 times, i think my hosting is ok or maybe my usage not that demanding.