Like many here, I design board games on the side -- mostly for my own fun. I put quite a bit of work into some of them. Will I ever have one published (either through me or someone else)? I don't know yet.
Presumably we don't want to include games in the database where one copy exists in the world (and no others may ever come to pass), but perhaps intent is more important than prevalence? If I were currently more ambitious (out there flogging my wares), would that be the time to add items to the BGG database? Or do I need to make a sale -- or at least make the "game parts" available via download (GIY -- glue it yourself).
It's mostly a matter of curiosity at this point; I'm not itching to put something up. I just wondered what others (especially other game designers) thought about it.