Sometimes airlines just shouldn’t bother…
Airlines like to use slogans like “includes valuable frequent traveler miles” in their advertising. Sometimes they just shouldn’t bother. Singapore Airlines’ KrisFlyer Miles program gives 10% for the lowest fare buckets. I think they would do better just giving 0% instead.
This is what I received on a cheap ticket to Kuala Lumpur:

The grand total of 19 miles! I received multiple times this amount of miles just by paying for the ticket with my miles earning credit card.