XIP#18 - Switch recommended vault fees to become (semi-)dynamic

Further to this there was a good suggestion from @Caps on the PUNK fee change post - XIP#17 - Update PUNK vault fees inline with new default fees - #3 by javery

The post is quoted below.

It’s becoming clear that aggregators are likely to drive larger and larger NFTX volumes. Our inventory will therefore be competing against the floor price of other platforms on these aggregators.

We can reduce our floor price and generate more visibility in aggregators by reducing the redeem (buy) fee. Decreasing the redeem fee will reduce yields for LPs and Inventory Providers (IPs), however this can be offset with an equal increase to the mint (sell) fee.

Proposed Alternative Structure

// Mint|Random Redeem|Target Redeem|Random Swap|Target Swap
// Default Fees
8/4/8/4/6 => 10/4/6/4/6
// PUNK Fees
4/2/4/2/3 => 5/2/3/2/3

In the above proposal, we decrease the target redeem fee by 2 percentage points and increase the mint fee by 2 percentage points.

By reducing the redeem fee we have greater exposure in aggregators, and by increasing the sell fee we capitalize on the relatively more inelastic demand of instant sell liquidity.

I think we should push this through as the stable recommended vaults as part of this prosal as well.

Thoughts?

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