My Platinum is mostly a benefits card, but I do use it for some AMEX offers, some airfare purchases, and in the last few months, purchases where Rakuten has a good reward. The most common I would say about 40% of months I put $500-$1000 on it for airfare or an AMEX offer, about 50% of months it has zero, and occasionally I put a (for me) really big purchase on it. I spend $7000 a few months ago for an item with a Rakuten bonus, but usually these are under $2000.

my big spend card this year has been the Hilton Surpass/Ascend card. I used it extensively the first half of the year, till I hit $15,000 and got the free Hilton weekend night to go alongside the free night from my Aspire card. I may do this again next year, or may switch to the Citi double cash card for unbonused spend.