You don't need to spend it all on travel and dining though to make it worthwhile. Nor do you (for now, at least) need to redeem on travel to receive the 1.5x redemption value (via Pay Yourself Back -
Maximizing cash back with Chase's Pay Yourself Back feature - The Points Guy ). The real value is point consolidation from other cards. Quarterly categories on Freedom/Flex, the Unlimited's 1.5% on everything, etc. Multiplying all of those by 1.5 instead of 1.25 means you come out ahead if you're generating more than about 60,000 points annually. I haven't put a great deal of effort into the exact $ or point breakeven but unless I've horribly miscalculated I think it's about 60,000 points total. Would be worth $750 on Preferred, $900 on Reserve vs $155 effective delta between the two cards annual fees. Freedom and Flex bonus categories alone could account for a big portion of this with each maxed quarter worth 7,500 points to consolidate to Reserve.
To be clear here I am talking about running a very large portion of my total annual spending through Chase cards. Even simple things like the fact that my power company offers no penalty for paying with credit card, and no incentive for paying cash. So that's ~3600 points annually towards that 60,000 number and it's money I had to spend anyway.
Viper GTS