I think it would be nice if FAB took a page from steam and had it so if you have something bookmarked and it goes on sale you get an email notification that your unowned bookmarked fab is on sale. Or even a full on Wishlist separate from bookmarks.
I will be honest, the number of games I have bought on Steam because I get a notification that “Hey, this has gone on sale!” are pretty high and I honestly think if FAB had a similar system for stuff that maybe is just too pricey at the time but then goes on sale I may be more interested in it without feeling like I need to monitor the store every day. I think it would be a benefit for both those selling on FAB and those buying on FAB.