As I've explained to @ibbtammy above, it's quality over quantity. If you have too many favorites, then they're not really favourites. I'd prefer people to be selective and choose posts that really mean something to them, otherwise some people may end up make a post every month or every week shilling their old posts, instead of writing about their favourite.

If say a year later you want to write about your favourite posts during the year, then by all means. In fact, I may even do that as a challenge at the end of the year 😉