This chart shows a ~5% net price increase year over year. That's a 40% increase over a 7 year period.
If the drug was originally:
$10k -> $14k
$50k -> $70k
The cumulative nature of these drugs is expensive. Enbrel is a 20 year old drug, at a 5% increase, the lifetime net price increase is ~164%.
If the drug was $10k it's now $26.4k. A $50k is now $82k. With increases OOP Maxes and co-insurance rising, patients are indeed paying a lot more.
Say what you want about price increases not reflecting rebates but even at a modest 5% a year, these increases have a substantial effect over the life of a drug.