I have some Maxim strawberry plant from last year. They weren't heavy cropping last year but this year some plants although produced flowers did not produce any fruit but produced runners instead. Are these plants worth keeping? If I leave them another year will they produce fruit then?

Also I have a 2 plum trees 1 red gage and a seneca next to each other and trained as espaliers. I put them in late 2004 got a couple of fruit on them but due to my neighbour knocking his wall down and a period of hot weather whilst i was away the fruit dropped. This year I got some blossom but no fruit. Any ideas what I am doing wrong?