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US healthcare spending represents $3.4 trillion[0]. $6.3 billion is only 0.18% of the total costs.

Not to mention that malpractice claims paid has decreased substantially (55.7%) in the last 2 decades [1].

And for a reference, we spent around $30 billion in the US in 2016 for healthcare marketing and advertising.

Also from your source:

> Mean compensation amounts and the percentage of paid claims exceeding $1 million increased

I'm not saying it's a huge component of healthcare costs overall, I'm just saying malpractice not a good profit motive.