Well, I think there is a maximum of maps a person can have as favourites. The more maps someone plays the stricter his criterias will become for a map to become a favourite map. Every now and then I check my favourite maps and decide to remove some since they cannot hold my criterias anymore. Ofcourse if you have only 100 maps you will also only have like 5 favourites. But at some point the number of favourites just can't go up anymore. 50 maps just _can_not_ be favourites. This is would be against the meaning of the word favourite.
Recommended maps - yes. Favourite maps - no.
Recommended maps - yes. Favourite maps - no.