When a speaker offers upgrades (e.g. Tekton)

Hi,

I'm looking to purchase some Tekton PenDragons.

Well just when I thought I'd ended my search I see they offer a number of upgrades:

• ClarityCap PX upgrade ($50-$65)

• Mundorf Silver-Oil Capacitor ($365-$440)

• Cardas silver rhodium binding posts – $75 pair
• Silver coated copper teflon internal wiring – $100 pair

Look, I've no idea what these things are. I'm sure they're supposed to make the speaker "sound better", but would I hear a difference? Has anyone experience with these (kinds of things)? Do you hear a difference?