Originally Posted by
Totoro
I was under the impression credit card elite night credits do not stack, so having more than one Marriott credit card doesn't bring you any closer to elite status than having only one card.
that seems to be correct for consumer cards. E.g., from Chase:
On or before March 1 of each calendar year, a maximum of 15 Elite Night credits will be credited to your Marriott Bonvoy member account operated by Marriott International, Inc. in accordance with Marriott Bonvoy terms and conditions. To be eligible to receive the 15 Elite Night credits with this Card, you must be the primary cardmember, your Card Account must be open as of December 31 of the prior year, and you must have an active Marriott Bonvoy member account linked to your credit card account. This benefit is not exclusive to credit cards offered by Chase. A maximum of 15 Elite Night credits will be awarded per Marriott Bonvoy program member account even if the member has more than one Credit Card linked to their Marriott Bonvoy account. When your Marriott Bonvoy member accounts are merged, if both accounts have received 15 Elite Night credits, only one 15 Elite Night Credit will remain
but from Amex:
A maximum of 15 Elite Night Credits will be provided per Marriott Bonvoy Member Account, unless you have both a small business Marriott Bonvoy Card account and a consumer Marriott Bonvoy Card account; then, you may receive a combined maximum of 30 Elite Night Credits (15 per Card account). This benefit is not exclusive to Credit Cards offered by American Express.