A little question about Left 4 Dead Ragdolls

So, I own Left 4 Dead 2 and I can play with Louis, Zoey, Francis And Bill in Some Campaigns. However, I can’t find their Ragdolls in Gmod. Where are they? Or, Should I waste my money buying The First L4D to get their models?

You have to buy Left 4 Dead to get the Left 4 Dead ragdolls just like you have to buy Left 4 Dead 2 to use the Left 4 Dead 2 ragdolls.

But I can play with them in Campaigns… Why, Valve, WHY?