I only have around 10 and use only 2, although i'm going to start a new one soon.
These will be a bunch of mini-sites.
I haven't done well with mini-sites in the past, but hope springs eternal.
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I swear, by my life and my love of it, that I will never live for the sake of another man, nor ask another man to live for mine.
I own around 450 at the moment, most are undeveloped though...