Maybe,
But if I can find the perfect part(s), but it's not for sale unless I buy these other 10 parts to go along with it.
It goes back to the; sell a part, make some profit, make a customer happy too (win, win) situation.
You don't get those synergies when they won't sell the part you want.
~Nate
P.S. And I'm not just talking about Calmini here, this applies to anybody who's in business to sell anything.