What if shine dust costs were proportionate to pack point costs?

Right now it costs
- 35 pack points for a ♦️
- 75 pack points for a ♦️♦️
- 150 pack points for a ♦️♦️♦️
- 400 pack points for a ⭐️
- 500 pack points for a ♦️♦️♦️♦️
- 1000 pack points for a ✨
- 1250 pack points for a ⭐️⭐️
- 1350 pack points for a ✨✨

Shine dust trade costs are exactly proportionate by a factor of 10 for ⭐️ and ♦️♦️♦️♦️, and roughly proportionate (factor of 8) for ♦️♦️♦️ as well: 4k for ⭐️, 5k for ♦️♦️♦️♦️, 1200 for ♦️♦️♦️.

Wouldn’t it be nice if DeNA followed suit for the higher rarities and made it 12.5k dust to trade a ⭐️⭐️, and 13.5k or 15k dust to trade a ✨✨? Right now the shine dust cost jumps to a factor for 20 compared to pack points for ⭐️⭐️ and 22.2 for ✨✨.

Shine dust would ideally stay free for ♦️ and ♦️♦️, but even if they changed that too, making dust proportionate to pack point costs for the higher rarities would really incentivize trading cool cards.