Posted for @tawdry swan
To avoid price crash, illuvials should have a chance to die but only in tournament matches.
If you keep producing something that is never used (like Illuvials) it will reach a point where price will fall, specially if there is more and more people producing it over time. I belive nobody wants a crash in illuvials price. For this reason illvuials should have a chance to die but only in tournaments and augments should be used and therefore disappear but only in tournaments where players compete for prizes.
Illuvials tier 0, stage 1 could die each match, stage 2 each 3 matches, and stage 3 each 9 matches. For other illuvials I propose Tier number x 1.5 matches. And then x 1 if stage 1, x 3 if stage 2, and x 9 if stage 3. So a tier 5 stage 3 will die on average every 216 matches, but this would be applied for all illuvials used in any round of a match.
This could be applied only to the loser of a competition match.
If you want to reduce the cost to craft augments you can keep the same recipes at overworld but instead of crafting just 1 you can craft 3 or 5 units.
This way players will need to have additional spare illuvials and augments in their inventory and if they lose one specific illuvial they will probably buy it at the illuvidex giving the game a 3% profit of each trade. Since weapons and armors should be permanent, augments should require solon to be crafted because otherwise solon price will fall.
The amount of Illuvials killed after each tournament can be returned again to availability in overworld. So in future if the chance to catch an old illuvial has dropped to only 0,1% after a tournament it may rise to 2%.
If game has good profit, dedicating only 5M$ more (6 instead of 1) you can organize 2 tournaments per year instead of 1 for the next 10 years and give in each tournament 300 000$ in prizes instead of 100 000$, which is always good for making people think that Illuvium is an eSport reference and worth playing it. Best thousand ranked palyers should have consolation prizes but still the big wins should go for the top best ranked players.