[quote=Pachamac]Only way you can really guarantee this is by making an rp and running it yourself and striving for this pacing. It's exceptionally rare to find rps doing this, but they're there.[/quote]

On the Guild I've only been part of a handful that lasted a long time.

2 of them were 1x1 however (and one has honestly milked for far longer than it should have been).
The third was group based, a huge anomaly among RP's I've been in here.
->Though fun note, it was with one person in that group that I had the non-milked 1x1 with.

That's out of 100+ RP's though, still a pretty poor track record. :/

I only case of consistent RP success I saw was on the site I used before the Guild, but that was because it was a dedicated community of players who were all also friends. And each RP was in the same universe (just somewhere else on the time-line) so there was more reason/investment to stay there.

[quote=Brovo]No really just find a good core group, works wonders. I got tired of searching and made my own and it works wonders.I actually have no real complaints. More astonished and pleasantly surprised that players I've invested time in to help grow are actually flourishing as a result. I suppose a gripe of mine would be when people complain that "newbies never learn", then never bother to try teaching them or looking inwardly at their own flaws. , projected exclusively by [/quote]

Obviously your RP counts as an exception, that should go without saying. :P
But it should be noted that yours started as a table top, not a forum RP which could have helped.

But yea, I agree that complaining about new people only kills a community. People all too often forget that:

1) They all used to be new too
2) That as old members leave we need new members to take over

It was never due to say "Newbies" though that an RP I was in died, it was just due to lack of motivation. People were no longer invested and they dropped it. 
For example, I was in an insanely promising ODST RP last month. The GM just got everything right and got players pumped to play, but then out of the blue life hit the GM and it all screeched to a halt. The RP died in an instant.