@Sasha,
Don't be too sure that the Walalos won't come back with an offer close to your thinking.I have a buddy who had a place here.They started at 10M,12,14 and then 17 a couple months down the line.He finally inquired if they would offer 20M after consulting missus.They had bought the place at 1.8M and 20M would have been a very good return.The next thing they know is the Walalos wanting to know a most convenient mode of payment.
Nothing great was ever achieved without enthusiasm.