As previously mentioned, in the long run filters are not all that expensive (talking domestic, air, fuel and oil, not ridiculously priced cabin filters
)
Service life for filters (and oil) is recommend by the manufacturers is a balance between protection and cost of maintenance to the consumer. Remember when it was recommended to change your oil every 3000 miles? And now the service life for most gas engines is 7500 with the filter at 15K? That has to do with the overall cost of maintenace to the consumer and is a selling point.
Granted, engines and the pats that make them go are superior to what was available 20 years ago, but being able to say brand A saves you $500 over the 5 year cost of ownership of brand B is a selling point.
That said, the mechanic in me (ASE Cert General Automotive) has me changing the trucks oil and filter at about 6-7000 miles. The fuel filter at least once a year once the weather turns to spring. I've never had water in the fuel,but if I started getting signs I would increase the fuel filter schedule. If I drive enough miles pulling the trailer over the season (read gallons of fuel burned), I'll change the filter in the fall also.
At 25K I just changed the main and pre air filters. They looked OK, but since the miles on them and the getting ready for 1200 miles in the mountains - I changed it.
I buy my filters and additives from Diesel Filters on line. I try and do my ordering (quantity) to get the free shipping.
Ordering online, with free shipping, I can get manufacturer branded filters at less cost then the aftermarket parts stores. You just have to be willing to buy in bulk.
Ford, Dodge and GM however do not make their own filters, they just set the specs for them.
Also the capacity of the air intake is excellent and no need to buy any aftermarket air intakes.
Same with the D-Max and probably the same with the Ford. No replacement intake for me.