The security and immigration lines are haphazard. As far as I'm aware, the immigration line jumping in the places that have it is just for business and first travellers (paid and upgrades). I'm expecting that the airlines who offer it pay for it somehow - so much per plane, so much per pax, some other metric (possibly X amount per landing slot). The security is a mess. Some places it is just for first/business travellers, many others for elite and first/business. And in some cases, the "priority" line is slower than the regular. So the cost is difficult to quantify

My view is that during irregular ops or problems, your paid business/first class passengers (especially international) should and will received "better" treatment. The question is how much better compared to the top status tier flyers. If you are flying first from one airline, would they be willing (even grudgingly) to switch you to another airline's first if they suffered a serious delay. Would they automatically put you up in a 4/5 star hotel (rather than the local 2 star airport one they normally use), etc... If they are, this represents a significant expense hit to them they need to factor into to their profit calculations. If they aren't, how does this impact the revenue they expect to get from a paying first class passenger? Given the variances in international first prices and quality and how many paxs are actually paying for first, these type of "contingent" expenses are factored into the pricing.