Although I don't normally cancel/change flights, if it happens I just deposit the funds into my wallet. I think (I'm not totally sure) that the certs they give you expire in about the same timeline anyway, so having it go to my wallet makes it easier to keep track of. As a 75k I'm flying enough where the funds get used within a month or two anyway. I think for me it would be too much of a hassle to book and then cancel everyday. Just my two cents.