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All of the issues that you listed have the potential of causing wear and costing more money if not fixed as well as using more fuel.
Poor aliment is going to cause your tires to wear out, it's also going to cause the car to handle poorly giving you less control on wet or snowy roads, you can adjust the aliment your self for free and get it close or you can pay someone else to do it and have the increased tire life be the payback on the out of pocket cost.
An air leak after the throttle body wastes gas but like was mentioned already if it's causing one cylinder to run leaner it can have the long term affect of a warped head or burnt valves or at the very least shortening the life of the O2 sensor that is trying to keep an impossible balance.
Front end being higher is not going to increase the cost of ownership other then you said that it makes the car unstable at highway speeds if it's windy out, that is a safety issue and it could increase the cost of ownership by forcing you to replace you car if it becomes to unstable to stay on the highway and heads off in to the ditch or another vehicle.
So you know what the issues are and that they are most likely costing you more gasoline and could very well be causing increased wear, so why not fix them? I'd start by fixing the manifold leak then take the fuel savings to pay for the other repairs.
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