This is a lie worthy of Jim Spergling or Spoony indeed. I'll admit, I've only purchased two of the cheaper DLCs for first Warhammer, but all of them combined go nowhere near that price. You're mistaking The Sims with Warhammer.
The fact is that most of the DLCs add more playable races, some of them extra campaigns, but these aren't really anything special, just few scenario differences, but same map. The main point is, this game is huge - you can easily play just 3 games that will last you 40 hours as one race and not explore some of the depths it has.
Scam would be if they took out something they've already prepared. With all DLCs, surely it's better, but it's absolutely playable and good value. You're not being robbed of anything as far as I'm concerned if you don't play as those DLC races. Would I want them to be free? Sure. But acting like it makes the base game significantly worse is just a ridiculous lie. You're not getting paid for this, you don't have to say this shit.