If you are willing, try to level them to 40 and sell for 2 te/pots during the time that has an enhance boost like in co-op event or occassionally, during some event like the last dice event implemented some enhance boost fest on that time. We all know that 4* feeders is not anymore necessary since 5* is the best feeder fountain nowadays, but enhance boost fest would be your chance giver to sell feeders to some players who are willing to buy.
As for Leana points, I don't think so if this will be necessary since the only useful items that are given be her were Ambrosia, 4* tix, Leana unit and Edwin. Otherwise, it gonna be a junk.