Hi Disko Biscuit
There will always be good and bad points working for any company. People will always be quick to pass on judgement about airlines.
On the one side you do work for your money. I am not going to pretend to you that it is easy, but on the plus side you will get to fly to some fantastic places and meet some fabulous people. You can expect to earn around £750 after tax and don't forget you will have your allowances on top of that. Your allowances will be paid to you upon arrival at your hotel in local currency. On an average month you could complete up to six flights, bringing your monthly wage up to approx £1,300.
On a typical east coast flight (LHR to EWR) you would get £95. It is really up to you if you save it or spend it. I used to blow all my allowances when I first started flying.
What more can I say but come along for the interview and work out for yourself if Virgin is really for you.
Hope this helps and good luck.