Just finished my first year
I'm not a high volume reviewer compared with some I see here. In my first 6 months I did about 50, and this second six months it dropped to 30 (which included a couple left over from the first 6 months), and there was a long delay reviewing some. This was caused by a family member being ill, and I stopped logging in to the program for a few months while handling that. I was worried this might get me booted out, and when I did log back in, there was a warning that the account would be closed shortly. I quickly started reviewing my backlog, and the warning went, but I didn't have time to order and review anything new, just to catch up with reviews of what I already ordered.
I have managed to maintain a 100% Excellent rating the whole year (a couple of the last ones are still on Pending), which might have been a plus point. No rejected reviews this time - I got one rejected last time with "we're no longer accepting reviews for this item". I only order things I know I can review well, and I am conscientious about doing so in detail, occasionally taking things apart to comment on design/build which would void the warranty if it hadn't been voided by the conditions of the Vine program anyway. I doubt I'll ever make Gold status on numbers, but if they factor in the insightfulness score too, maybe I will at some point.
Anyway, into my second year now still on Silver, and already ordered a couple of things.