It is about balance though, you are right, there should be a more sustainable approach to the signings but we also need to consider that the first 11 needs a complete overhaul. Neither can be done overnight but to get to a point where we can realistically think about younger players with a more positive outlook on any potential sell on value is to get us in a position where we can do that without ignoring the fact that we need a better 'here and now' plan.
We have had neither for a few years now, so the argument is, what comes first? I very much doubt they can be both be done at exactly the same time (in our situation), in regards to players that can come in to the first team and improve us. Younger players may take a little longer to fit in than more experienced players. There is an argument that we stabilise the first eleven in the here and now, with more experienced players, who may or may not have sell on values, and then work more on the financial aspect once we are on a bit more steadier ground.
Buying/loaning a 26 year old is not the end of the world. If you don't think he is good enough, then fair enough but as a business model it is not necessarily going to continue to sink us, as long as the rest of the summer is used to get players as part of the same plan, for on the pitch.