Why has focal raised their prices so much on Sopra line

Supply & demand. They were $15k when they came to mkt. Now after they have sold their target #, they understand its popularity and peoples desire to own it. So, they raise the price.
Plus consider this. Sell 5 pr @ $15k= $75k. Sell 4 pr @ $19k =$76k. IOW, more profit. But they also have saved parts & labor on a pr of speakers. When people quit paying the price they will lower it. But they aren't in the business to lose $$$ either. It HAS TO make a profit to survive. So, it becomes a balancing act.

There is also more opportunity to sell at higher prices as the number of high net worth individuals (HNWI) increases.
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Because they could.  I understand the points some are making here, but a near 25% price hike?

Agree with mtrot. Because they could. Harbeth did the same thing repeatedly because people still bought them. Materials don't go up THAT much.

Do not buy them. That’s why capitalism exists. Competitive marketplace.