I think, for the player it could depend on their ambition, they’re more likely to move up the leagues with us than their current clubs. For our club the consideration will be financial:-
Are the players in contract? As you say SS might want silly money for Blackett if he is.
Are the players FT or PT? If they are PT with well paid jobs we might not be able to match their total wage, will ambition to be a FT footballer bridge the gap? If they’re FT we must be in with a chance.
I’d just like to think we, at least, asked the questions.
(BTW didn’t Jamie Vardy used to be a pound shop Michael Owen? That worked out OK for him.)