Your point about lighting is valid, seeker. Having said that, the LPV minimums are 101 feet lower than the LOC MDA and you get vertical guidance all the way to the runway. As more and more RNAV approaches are published - most of them with LPV minimums - I think it's getting less and less likely that airports will be installing ILS's in the future.
I'm sorry, seeker, but I don't think that it's the airports that are too cheap. A modern aircraft arriving at Halifax that night would have flown an RNAV approach to LPV minimums, rather than a non-precision approach. It was 2015, after all. Are there still aircraft in the fleet incapable of flying RNAV approaches?