You don't need a 45% gross profit margin to fund R&D and with AMD using mainstream to liquidate EPYC defects, AMD's gross profit margin on most EPYC2 SKUs should be absolutely filthy. That's where you get the R&D money.
A company is not as profitable as their most profitable product, at its most profitable point. Over time, and over their entire product portfolio, their margins will be more modest.
Also, server development and support is more expensive than consumer. Their server CPUs have a lot more features and functionality, which incurs additional engineering costs.
Also, like I said, AMD has quite a lot of debt.
Finally, as everyone knows, as Intel turns up the heat, AMDs margins will suffer. So, it's imperative that they start at or near current industry pricing, because it's only going to drop from there.
So, whine and moan all you want. I guess it's in your nature. AMD is behaving in a rational way and not particularly exploitative. Maybe you'd like them to be charitable, but they're not a charity and I trust they're doing what's best for the long run of their business. And that's ultimately what will benefit customers and consumers the most.