People who need to resort to constantly eating pizza and fast food items are those with mega-calorie intakes (>5000) for whom eating squeaky clean is too cost and time intensive (food preparation and time eating). Meeting a calorie need of 3000 to 3500 for a complete newb weighing a buck-60 to -80 is a joke and can be done with the foods you mention and some other items - fruits, veggies, lean meats, healthy oils, nuts, seeds, cheese, cottage cheese, protein powder, milk, yogurt, eggs, and egg whites.
You wrote: "I was thinking that I could do that sort of thing on sat nights and follow w/ a pulse fast or low carb day on sunday and be ready to bust ass all week in the gym. Is the pulse fast really worth the $150 though? Or could I get the same effect w/ a low carb day?"
You said you're learning, and this post indicates you still need to learn. Have a damn cheat meal once or twice a week and it call it a day (or night)! I haven't looked into some Biotest pulse fast, but a protein sparing modified fast can be done with five to ten bucks for a day with egg whites, chicken, turkey, fish, and some veggies.
Why are you thinking of some complicated shit when it's clear you should be on a lifestyle diet with some indulging here and there and learning how to set up a basic diet and training program?
If you have a cheat meal, just eat until satisfied - not until stuffed, which would cause a problem over time (fat gain). If you feel you need to eat a little less the next day, do so.
Do I think any type of fast is worth so much money? No! I've done protein sparing modified fast consisting of almost nothing but cans of tuna, salmon, and chicken; low fat cottage cheese; egg whites; and vegetables. Actually there were some days where I was pretty much on an old school fish and water diet. Cost? Next to nothing.