Justifying MAC Face and Body, Should I or Shouldn't I?

Hey lovely ladies

After watching Laura's video review on this I really do want it. She makes a point that it is really reasonable for £23 for 120ml. I thought for a minute, reasonable?! Seriously?! But have a look at what I've discovered and it really is (all prices from Boots)

Revlon Photo Ready Foundation £12.99 for 30ml

= £51.96 for 120ml

Bourjois Healthy Mix Foundation £10.99 for 30ml
= £43.96 for 120ml

L'oreal Matte Morphose £11.99 for 20ml

= £71.94 for 120ml
.
But worst of all. . .

Chanel Vitalumiere £31 for 30ml
= £123.99 for 120ml

So what do you think? Can I justify my purchase?

Love Sophie xx
PS All images courtesy of Google Images