I did JC and loved it. at the time, it was just me and yes, i prob was spending around $130 a week on it.
I never got hungry, after the first 2 weeks and pretty much lost all of my cravings for junk food. I lost about 1kg a week, which sounds like not much, but the weeks flew. I needed to loose around 15kg.
My only regret is that I quit when I met DP, was too hard to eat separatly and we were in that party/brunches/ eat out phase of a new relationship.
I have put some of the weight back on and do believe it was due to not following the program thru. They say I takes up to a year to reprogram your brain.
It was expensive but worth it and 3 of my other friends joined after seeing me. None had as much success as me tho. But I was pretty dedicated.
The one thing that I will be eternally grateful for, was that they switched me from hardcore beer drinker to vodka and soda with a twist of fresh lemon (never cordial)
My hangovers 1/2 immediatly (all the water) and 1/2 the price. Not to mention the embarrasment of rubbish day when it sounded like a clean out at the local brewery
Go for it, It will work but so will most of these programs if you commit to them.