I started a similar thread to this 6 months ago, only with $45k in the title and figured I'd do another for data point purposes. I just passed the 6 month mark and requested/received another CLI from Amex.
I'm 100% convinced that $5k/6mo is a standard for many when it comes to Amex growth through CLIs once you get passed the $35k limit mark and do not want to provide income verification. This was my 4th $5k increase; my growth on the card (BCE) starting with the SL in June 2016 went:
$10k --> $30k --> $35k --> $40k --> $45k --> $50k
As always, I did request a couple of greater amounts ($60k --> $55k) and backed out of my browser to try a lesser value once prompted with IV language. Instant approval at $50k. The $5k/6mo train continues to cruise along. I'm not sure there's any point in me trying for more in 6 months, but I probably will when that time comes.
I will say that spend in the card IMO is quite irrelevant to receiving these CLIs, meaning it doesn't have to be significant at all. My combined spend over the previous 6 cycles prior to receiving this CLI was $1444.39, or roughly $240/mo. That's less than 1% of the credit limit.
I always PIF my statement balance, usually my current balance and have not paid Amex a penny of interest since opening the account 26 months ago. I did allow a balance of less than 2% of the limit to report a week ago prior to making my CLI request.
I provide this data just to show that you can grow a quite large credit limit on an Amex card with a minimal spend and without providing IV, so long as you're willing to do it at a steady/reasonable pace.
@BrutalBodyShots
Super Congrats on your Amex BCE CLI to $50,000!!! 
Your personal experience and your blueprint for success are simply
invaluable. You fought back the constant urge of being impatient
and relied on your persistence and consistency to work your plan.
Very well done!
Congrats again on your success. Thanks to you, we now know
exactly how to proceed with Amex. Thanks for sharing!!!
Congrats on Amex huge CLI!!!!!!
Ok, I am concerned with the data points needed yet nothing received....
Starting Score: 475
Congrats! The interesting aspect to me is it didn't require much spend at all, and $240'ish per month is easy for anyone. Thanks for the update!
