The point being that £5M players will happily fit ito our wage structure. £20K a week? - bite yer 'and orff, Guv'nor.
In your last para. the operative word is 'should' - yes, indeed he should, but he might well be happy to be the next Ferrari-owning Jesse Lingard (I'd take that in a heartbeat...
The logic of that is fine - the only problem is that anybody using that logic won't be a PL footballer! Their brains (and their agents') are wired differently!
I would do it, I'm sure you would too. But neither of us are eaning £300K a week! To some, it's about the status rather than the need...
That's not the point though. If we sell players for, say £100M total, yes, there would be money in the transfer kitty to pay £45M for one player - but not in the wages budget. A £45M player would expect at least £100-£150K a week (and this one's apparantly on £300K a week!), so we trot on!