For someone who's into collecting smalls and ephemera they are pieces that would be added to a case display.
Not tremendously valuable because they were printed in mass quantities as mailers, member or subscriber pieces, etc. Perhaps $3-5 on the Mobil Happenings and $10 on the other grouping.
Earlier ephemera brings more as well, 50's and earlier especially. Early racing pieces, programs, etc. Early Petrol catalogs, shop ordering catalogs, etc.
Some ephemera (supporting items in advertising) can be worth substantial money, but by and large the majority is low priced, easily affordable stuff entry level collectors or very specific brand collectors will pick up.