It does make me chuckle the people who just have to get on board a plane first so that they can sit and wait... until the last person gets on.
I can understand being prompt and boarding earlier to get precious overhead locker space for your bag but to pay for this is a bit too much.
Especially as when some gates that are miles away from the waiting planes and you have to get a bus there. So all you are doing is paying to board a bus first- and then getting off last*, which in turn puts you to the back of the queue to get to your "reserved priority" seat.
*First on, last off, if the bus doors open on the same side.