im getting a bit nervous about continuing to do the coin churning as more stories like the OP come in. However for whatever reason last week i actually got a credit increase! At first i thought it was a fluke because of my numerous payments in a month, but i got the letter confirming it the other day.

im charging about 6-8K a month on coins and nothing else...which i think may be a red flag for amex. Also, i don't bring in much income either as im a student. hopefully my account won't be closed or my parent's cards for that matter as they don't do any churning.