MILES+MONEY

I have checked two or three times over the last few weeks comparing fares off Virgins website and also the same fare as a miles + money option. The miles + money has always been more expensive.
eg. £578 PE fare in Feb. Same fare M+M £650+ 7500 miles? Surely this can`t be right. [?]
Has anyone else found this?
eg. £578 PE fare in Feb. Same fare M+M £650+ 7500 miles? Surely this can`t be right. [?]
Has anyone else found this?