I have three credit cards with decent referral bonus programs, for both myself and the person being referred. I don't know anyone (in person) who likes to juggle credit card rewards like I do, so the few people I've mentioned it to say things like "Oh, no, I only use one credit card so I don't get myself into trouble", or "That's way too many things to remember - why do you use different cards for groceries, restaurants, and everything else?". Le sigh. Why wouldn't you want a free $250 on $1000 of purchases AND 6% back on groceries?