The phrase "would be expensive for" is correct and usable in written English.
You can use it when you want to express that something would cost a lot for someone to purchase or do. For example: A trip to Europe would be expensive for most families.
It would be expensive for them in the long run, more than they can imagine".
A downgrade would be expensive for the school because it would mark the bonds as riskier, which would force the school to pay higher interest rates in the future.
It would be possible to develop a system resembling the Wi-Fi hot spots available in places like airports and coffee shops, although this would be expensive for long interstate routes.
And, once the crisis hit, banks had a new incentive to distort LIBOR: if their estimates were higher than their peers' (meaning that it would be expensive for them to borrow money), investors, creditors, and regulators would worry that they were about to go under.
However, it has been recognized that handling dual processes such as the development of cash usage and card usage— for a long period would be expensive for both the payments industry, and its customers (Tumpel-Gugerell 2009; citealtEuropean12009
Now, it's not like it would be expensive for you to change this stuff.
Mr. Gillespie knew cutting pollution would be expensive -- especially for Duke, because its exhaust was relatively clean already.
That would be expensive and embarrassing for eurozone lenders since two bailouts would have failed.
In either case, the extensions would be expensive: perhaps $2.7 trillion less for the Treasury through 2020.
That would be expensive and time-consuming for the F.D.A. and pharmaceutical companies.
But Reckitt, for one, would be expensive.
