The jump isn't quite as universal as it might feel - plenty of solid games are still hitting shelves at reasonable prices, though yeah, the expensive end has definitely crept upward. A big chunk of this is real inflation combined with supply chain costs that are still higher than they were a few years back. But there's also been a genuine shift in how publishers approach design and production. Games tend to have more components now, better art direction, and higher production values overall. They're not always charging more for nothing - there's often more stuff in the box.
That said, publishers have also gotten savvier about pricing what they know will sell. The board game hobby has grown, so there's less price sensitivity at the higher end, and Kickstarter has normalized the idea of $80+ games with deluxe components. Retailers markup differently too depending on demand. You'll usually find better deals at places that focus on volume over margin, and yes, older versions of popular games are often legitimately cheaper. Just check what's actually different between editions - sometimes the newer one really is worth the cost, sometimes it's just nicer artwork.
If you're price-sensitive, you've got options. Don't feel pressured into the deluxe editions of everything. Tons of solid mid-tier games stay under $40, especially if you're not chasing the latest releases. Checking BoardGameGeek or similar sites can show you which games hold their fun factor without the premium price tag. Used copies can be great too if you find them in decent shape.