+ 1 I agree generally that we see a lot of posts of people who app too soon and for too many cards.
No, it isn't average. It's huge. Yes, it's a canned statement.
IMO, The OP's starting line is average (maybe upper average). I think this site is just flooded with so many low SLs from mid 600 scores that something like this seems outrageously high. When in reality, when you app when you're supposed to with the scores and file that calls for a prime card, this is what you would start out with. Hell, everyone could start with this if they waited.
Side tracking I know, but I needed to get this out.
Congrats to you !!!