I see no real advantage to PLUG becoming a 501c3. The group has no dues and has to my knowledge never charged for anything besides a t-shirt that was purely optional. If you are so petty that you can't buy a pizza or buy yourself a few things that makes things you do for the group easier then you may be in the wrong group.
I know Hans and Brain both have contributes thousands of dollars over the years and I have never even heard them once ask for any help. Anything money I have spent on the group is because I choose to for the bettering of the group not because of a tax break.
I think the 501c3 would just add an extra burden on someone in the group to keep it up but really serve no value to the group. It won't get us more presenters or more supplies for installfest.
Just my two cents though.
Just my two cents though