We often see people post when they open a massive amount of accounts when first starting up. Although it doesn't seem like we hear much about the after effects a year or two later and how it all worked out in the end. This is a question for people who go from having little credit to opening like 20-30+ accounts within a year. I'm an advocate of the slowly building up a credit profile, but for those who have done this and it has been two or more years what was the end result? Do you regret it? Did you end up dumping many of the cards? What was the impact on your scores? Did you hit any AA? Have you had issues getting new approvals or CLIs? Were you stuck with mostly toy limits? Would you do it again? What would you do different?
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This was me in 2013, I went from 0 accounts with collections/charge-offs on my credit reports to clean reports, no late pays, a new car and 30+ accounts. I don't regret it and I have never been AA'd. Some cards have toy limits (Comenity) and some do not (GE/Synchrony), plus I have 8 major CC's a few with $5000 limits. However, there are cards that I applied for because they were all the buzz on this site, but now find myself never using them. Oh well.....but all-in all, no regrets! Luv this site and glad I found it! 
I'm one of the ones who started out slow as it was suggested to me back in 2012 (my first post on myFICO). I started with two secured cards and managed them as suggested. I PIF and used them regularly. I generally had a low Util % posting, but occassionaly that wasn't possible. I saw little to no improvement in my credit scores. Once I had a couple baddies fall off my CRs then I saw improvements, but I saw very little with just the two secured cards I opened.
One day while on CK, I saw that my EQ score was over 700 and my TU was in the high 600s and I wondered if I could be approved for CCs. From experience, I knew my CK scores were at least 50points higher than FICO 8, so I decided to go for some fair/good CCs. I decided to apply to them in a short period of time because I thought this would give me a better chance at approval. To my surprise, I was instantly approved for my first two cards. I thought doing two a day was best, so I waited a bit, like 2wks, and then applied for 2 more. To my surprise, I wasn't instantly approved! I didn't know what to think but while I was waiting to hear back on the two (NASA and BofA), I applied for Discover it Miles and again, wasn't instantly approved. I received a call first thing the following morning and the CSR told me that they reviewed the documents that I attached to my application for verification and informed me that I was approved. It was at this point that I remembered the forum here and came to ask what I should do given that I wanted to use my rewards cards frequently. It's at this point that my Barclay's card had been supplying my FICO 8 score and I saw it go from an intial 666--->674---->687. To say I was shocked is putting it mildly, but I wanted to keep my scores decent and I knew that meant keeping my Util% low which meant i needed more CCs otherwise I'd have over 50% if I wanted to take advantage of my rewards. In short, I went on another mini spree (2/3 approvals) and now my FICO 8 score is 676. I suspect it'll rise again once all my cards are reporting given my low Util %.
I really wish I had taken a more aggressive approach to my rebuilding back in 2012. Fortunately for me, I don't plan on buying a home for about 2yrs, so that gives me plenty of time to get my scores and AAoA (now at 5+ yrs for both TU and EQ, and around 3+yrs for EX) back up. While I can't say that getting 20-30 new accounts in a short period of time is what's best for most rebuilding, I do think being more aggressive than opening 2-3 is what is best, in my experience. As with most things in life, it's all about moderation.
