That's what I was thinking. My main card is a Chase Marriott because points count toward lifetime status, and other reasons. There are point multipliers for certain categories such as travel. I assume buying a gift certificate won't qualify for a bonus, unless it's recognized as UA and categorized as travel.

For me, more RDMs aren't really that valuable, so that plus the category bonuses, plus the extra hassle at payment makes this an easy decision to avoid, at least for now.