Chelsea certainly don't want to suffer losses after they bought Lukaku from Inter Milan for close to £100 million and it's only natural that they set a price of 30 million for Lukaku in this transfer window this season.
Whatever the amount any clubs buys Lukaku from Chelsea, it would still be a loss for Chelsea because nobody is going to buy him for the 100m that they got him for, not even remotely close.
Nobody is going to offer anything more that 40 million Euros for Lukaku, except clubs from the Saudi league and he has made it care that he doesn't want to go to Saudi Arabia. SO in my opinion, its best for Chelsea to just sell Lukaku at the price that Inter have offered. Chelsea do not want to keep Lukaku so what's the point of dulling the deal. Lukaku would surely be sold and if Chelsea don't sell now they might sell him for a lower price late on in the transfer window.