I just got the annual fee for two of our Barclay's cards (one each) today. $89 each.
I remember last year having just started tradeline sales, debating if it was worth it to pay the fee. Decided to speculate and pay it and see.
To date, have made $3925 with them from new company, and last year made $450 with old company = 4375 minus annual fees (89 times two cards, times this year and last year) = $4019 earned (or just over 2k/card for the year) after fees. They aren't my most lucrative cards (too new, so smaller payout and less interest), but it's still free money.
This is just on those two cards (we have other Barclays and Discover and B of A and Capital One and such). I saw the $89 fee hit both of them today (we signed up at the same time several years ago for a signup bonus, so same annual fee timing) and went "hmm, I think that was well worth it... let me check my spreadsheet on what those two cards in particular earned."
Sure, they're not close to maxing out their full earning potential, but it's hard to complain.
I know there are others making quite a bit, and not necessarily wanting to post about it, and that's okay. I know it's frustrating for those that aren't seeing many, or maybe any, sales, and that sucks. It's worth it to enroll anyways, IMO, and wait, as there's very little downside and lots of upside potential if the tradeline business grows.