In Philippines, a famous strawberry farm situated at La Trinidad, Baguio City opens their doors for everyone from November to May for this unique activity. The price of strawberries there is twice the price of what is available in market. Strawberries are very delicate fruits and if picked by amateurs, the plant itself can be ruined. Considering how they are maintained, I think there will be no price argument even if you do all the labour. Plus the experience is totally fun.