Neymar's fee is £190m, not £150, unless Barcelona decides to sell on a discount.
https://www.fcbarcelona.com/footbal...17/neymar-contract-extension-2021-fcbarcelona
Then there's his wages, he signed a new contract last year and he now reportedly earns €25m a year (£435,000 a week) and in Spain wages are usually reported after tax and this might be so as well.
If Neymar somehow becomes available, United, PSG and possibly Chelsea will be in on it too. But I don't think he'll become available but let's assume he does.
If the rumours of other possible transfers are true, we'll end up spending close to £150m on 2 full backs and a defensive midfielder alone, and United will spend £85m on Griezmann and possibly another £40-50 on a midfielder alone. Both clubs will spend more on other areas before it gets to a Neymar type spending. If and by the time Neymar becomes available, PSG could be in a better financial position than both.
Anyway, to me it sounds like a pipe dream, but it would be great if it happened.