$600 a month in travel — about $7,200 a year — is the level where everyone assumes a premium travel card finally pays off. Run the net-value math and the assumption mostly breaks.
The reason is plain arithmetic: a premium card's travel multiplier only applies to your travel spend. On $7,200 a year, the gap between 2x and 4x on travel is real but modest — and it rarely covers a $395–$795 annual fee plus the ground lost to a card that earns well on everything else. So the cards that win on raw rewards here are the ones with the strongest all-around earn behind the smallest fee, not the flashiest travel perks.
That doesn't make premium travel cards pointless — it means they're justified by their benefits (lounges, credits, insurance), not their earn rate. The math ranking comes first below; then when to pay for the perks anyway.
Key insight
On $7,200/year of mixed travel — flights, hotels, rentals — the cards that win are the ones whose bonus covers all of it. Rates scoped to airfare booked direct (Amex Gold's 3x, Autograph Journey's 4x, the Platinum's 5x) earn base rate on the hotel-and-rental half of a real travel budget, and it shows: charged its full fee, Venture X nets ~$381/year, Sapphire Reserve goes slightly negative, and the Platinum lands around -$582 on this wallet. The winner is Citi Strata Premier at ~$650/year — its 3x covers every travel dollar plus dining, groceries, and gas — with the flat-2x Venture (~$531) and the no-fee Altitude Connect's 4x travel (~$526) close behind. (If a big share of your $600 is airfare booked direct, enter that split when the calculator asks — flight-scoped cards then get credited honestly.) Premium cards become the right answer only when their lounges, status, and credits — value you have to actually use, which we count only when you opt in — are worth more to you than the ~$269/year of net rewards you give up.