I'm never great at parsing Dean Mayer, but I think the 'wasted' means it's an anagram of wise men and then you add e/Energy+per/a (£5 per head,£5 a head). This is
Sorry, I pressed 'submit' too early. All I was going to say was 'This is the best I can come up'. And now that Mamya's parsing is similar, I think we're correct.