It doesn't matter, but it matters.
I can definitely be a bit of a tying economics nerd. I know what my hooks cost, beads, sometimes feathers and I hate being wasteful. It's good to make the most of your materials when you can. You paid good money for it you may as well get as much as you can from it.
I will use my DynAAmite leeches as an example. Usually, I will separate the marabou into palmering marabou and tails. From the tails, I'll pull them 25-30 at a time and prep them to tie the leeches. By prepping, I mean, If they are adequate to use the whole feather, then I will do so. Most often, they are a little bulky or big for the smaller leeches. I'll cut off what I need and you are left with a "V." I will sometimes use one, but most often, I will use two "V's" for my guide flies.
I've found over time that once marabou is wet, it doesn't really matter too much what the feather looked like when dry. I use the premo ones for the leeches that are sold at Fishtales. I use the reject V's for my guide flies. Please don't feel slighted about the ones that you get while on a guided trip. They will work every bit as well. They just may not have the bin appeal.