I didn't have a mortgage when I started applying for CCs. I didn't have a score at all before 2/2006 and the scores in 10/2006 (when I started applying for CCs) were high 500s to low 600s. All FICOs now are 660 - 670 range now, climbing regularly.
I had one medical collection showing from 2002 (it's in dispute now as I didn't even live in that state when they claim I incurred the debt..lol)
I had one unsecured (co-signed) installment loan opened in 2/2006, no lates.
I actually played roulette and won, but I wouldn't advise it for everyone; I opened a total of 6 CCs between that first card in 10/2006 and 4/2007. It was deliberate, because I knew I wouldn't keep the first 2 open past the first year (they were intended as starter cards and come with high AFs), but I was pretty surprised I didn't take more of a hit on the new accounts. The scores never dropped with each new account; they only increased between 2-5 points with each of the 4 new accounts opened between 3/2007 and 4/2007, but they're now on a steady rise. The scores were in the low 600s when applying for the last 4 CCs.
Maybe it had to do with income and DTI, too, who knows; my DTI even with the new accounts is 7%. At any rate, it just adds to the well known fact that that there isn't always rhyme or reason to the scoring. I'm often bumfuzzled myself when I see much lower scores with CLs in the 1000s.