A few of our signings at least could have worked out.
i.e. Murphy, Whyte, Decordova-reid could all have gone for a profit if they had kicked on.
But players like Pack, Flint, Bacuna, cunningham etc aren't likely to have any residual value to speak of towards end of their contracts.
I guess you need a mixture of both types of signings (and for some of the ones you sign to develop to actually develop), but over the last few years we've made too many of the latter IMO.