Question and comment:

Question on putting big spend on a CC... can someone explain the concerns with this? If you have a $25k (or whatever) credit limit on a card, and you put a $24k charge... and then pay it off quickly... what is the risk here?

Comment about using a CC for taxes... I do think under the right circumstances, this can be a breakeven prospect. Let's say you have a $60k tax bill. If you have a Hyatt business card, and need (for example) 30 tier qual nights to hit Globalist, or for a Tier status, I believe the math works out. You're basically buying Hyatt points at 1.87/cents, which feels like a good sweet spot for redemption. PLUS, you're getting the bonus of additional milestone rewards (hitting Globalist, extra points, extra upgrades, etc.). So if you can pay off the card quickly, it feels like this is a reasonable scenario.