MSPeconomist

I can understand having one personal and one business card linked to your account, but to me linking any more cards to the same account sounds fraudulent.

Someone is also paying a lot of annual fees (assuming that otherwise there wouldn't be so many SPG AmEx cards for OP and/or his/her friends and family), so this scheme is equivalent to paying over $750 per year to be SPG Plat and never stay in Starwood hotels. Maybe there's a sweet spot for someone with some stays/nights to benefit enough from Plat benefits to justify some additional credit card annual fees but it's not obvious beyond the fact that one annual fee costs less than the very best five night mattress run or even two stay mattress run if someone qualifies that way (and doesn't get SNAs, thereby making Plat status less valuable).