Luxury Deals buy/sell gap, what influences them

[Infixo]

As expected, YIELD_GOLD affects the valuation. BUT: I tested:
PSEUDOYIELD_RESOURCE_LUXURY
PSEUDOYIELD_HAPPINESS
DIPLOMACY_MAXIMUM_LOPSIDED_DEAL_MODIFIER
DIPLOMACY_SIGNIFICANTLY_LOPSIDED_DEAL
GOLD_PURCHASE_MULTIPLIER
AI_BASE_LUXURY_VALUE
AI_DISCOUNT_RATE
And none of it affects the valuation. That's very disappointing.