14 credit cards isn't really that impressive. It's the debt that's impressive.
I have a costco credit card, an amazon credit card, an AmEx travel card, a carecredit card, a CapitalOne quicksilver, and a Discover rewards card, and I'm not old enough to give a shit about all the retail cards that are offered. The main difference is that I keep a running balance of $0.00 on all but one of those cards. Multiple credit cards are great for using each one for specific purposes to get the maximum bang for your buck in regards to rewards, however credit card companies know for every responsible user who games the system to get like 6% back on fucking everything, there's a Phil that WILL max out every like of credit he can get.
This eventually backfires when the Phils of the world file for bankruptcy.