Arguably Mrs May has saved Brexit: it’s hard to see, had the likes of Davis or Rees Mogg been in charge, how the whole thing would have blown up in everyone’s faces by now. I know there are ground criticisms of her approach, but I don’t see how the current Tory turmoil could have been avoided. Once the negotiations started there was always going to be blood on the blue carpet.
But material gain, to get back to the point: no. That was never on offer as honest supporters of leave will admit. If you wanted to be better off you had to vote Remain: however as we know that argument was trumped so to speak by other concerns.