Actually there is more to it...suppose you go to the market today and ask for say the material for the missiles...no one is going to give you any information....everyone will commit to supply you the items but finally nobody will supply you...everyone knows the item is not for making utensils...so you can rest assured you are not going to get anything from the market. Now once DRDO shows that they have the capabilities....sudenly you will find many people interested in you for collaborations and all....so it is a dynamic system..and a completely selfish approach is required here....so..once we ask these defense companies for the order of so many air crafts..it is in our favor that we force them to extract as much technological information as possible....
