I submit to about 100 LLs, but most of the traffic you will see come from about 20 or so of them...I do the rest because you never know where that sale is going to come from!
I guess I could save myself a bit of work, but every LL I submit to does give me some traffic & that's why I keep them on my list. The "big boys" (and girls!) do account for about 75 -80% of my traffic.
as for mirroring, I make a separate folder & have each page duplicated (index, main, gal1 gal2) so each index has a whole site in the folder.
Ponygirl