Is it worth it to switch from Cobalt to Platinum?
I usually get offers to switch to Gold, but recently got an offer to switch to Platinum with a 170k bonus. Reaching the bonus threshold isn’t an issue, but I’d be earning much less points with the Platinum otherwise. Is the move to switch, earn the bonus, and switch back to Cobalt after 2 years? (40k of the bonus pts offered with the platinum are earned when you make a purchase between 15 and 17 months of Cardmembership)