Model Packs are not made for one person alone (ie. custom work). Anywhere you go, if you want the sole rights to something it will cost much more, because the artist cannot sell it multiple times. Additionally; if you ask an artist to make something specific for you, but let them retain the resell rights...they may or may not decide to go for it (which is where you can make suggestions in various threads around here, and hope someone makes them).
What you are asking for, as far as the price you've quoted, is pretty ludicrous...to be honest.
For that kind of work (created by someone who knows what they're doing, and can follow through with it), you can also expect to pay some of the money up front as well.
Don't take this the wrong way, but this is how this type of work is done; especially at the level you are expecting.
-Keith
