Does this sound like a lot of yeast?
That is a huge starter?
That is about $45 wort of yeast.
If you wanted to use only 3 vials of liquid yeast Mr. Malty calls for 3 gallons of starter. WOW! That is 25% of the entire batch.
Who has a starter flask this big?
Lager starters are huge.
You could do a two step - by my estimate pitch two vials into a 3 liter starter. This will get you about 7 vials worth. Cold crash, decant, and add the yeast to a 4 liter starter. Cold crash and decant again. You don't want all that spent starter in your beer.
If you buy an 8 liter flask you must sleep with it next to you.