Why Open Source Works

I'm studying Apache OFBiz for some time, because my company Vismaad is expecting a project in which we will be using it.
I ran into some problems and had to ask for help on ofbiz mailing list. It usually takes under 40 minutes to get an answer and if problem is not severe (means only you are doing something in wrong way) you can solve it in under 2 hours.
Great!!

Many commercial help desk services cannot give you this kind of support. But still people relay on commercial services.