Labour needs people like Sugar (who is a former Tory donor) to be in the party for them to be credible, representative and prove that the party isn't just about aiding the least successful.
I agree with this as well
Not that I agree with the idea that rich people should be unwelcome in the Labour Party (provided they genuinely support what it stands for, including recognition that it may not be personally short-term beneficial for them), but 'aiding the least successful' is hardly a bad thing for a party to be about, considering that 'successful' typically translates into 'fortunate'.