I never tried Strawberry Crops so far but I have a close friend who does. Seems to me that about every 5 to 7 years he is sending away for new plants and starting over with fresh topsoil and fertilizer. I'll ask him about his experience and let you know.
I do know that around here the first berrys (known to me as Queen Berrys) are the biggest of the crop, the rest will be smaller in the types he has planted .
Quite a few farmers in Pa. have PYO farms and grow Strawberrys, among other things, and do pretty good. But then, you are talking about Acres and Acres.