perhaps it will be better to set 2 independent parameters for BSIP86, one global parameter which is controlled by committee, the other is a asset parameter which is controlled by asset owners, committee can maintain the global parameter conservatively, in some scenario asset owner can set the asset parameter, and the sum of the 2 is the final "market fee sharing rate", this provide the possibility that different UIA own different market fee sharing rate if scenario request.
Market fee sharing is a good idea, however I think it should be done on an individual basis, for example a user trading a specific asset, say GATEWAY.BTC can get a share of the market fees from this asset as his reward, the asset owner can specify a certain condition for the user to get this reward, conditions like; must be LTM, user must trade above 1BTC or user must have up to 10BTC deposit monthly, etc. It should not be a forced tax, however should this be implemented as is, asset owners should be given the complete freedom to opt in or not i.e under update asset> charge market fees> share market fee to network> default 0%> adjust to max 100%, in this way asset owners still have full autonomy and can still contribute to the network if they wish to.... Some asset owners can even decide to be generous and set market fee sharing to 100%