Yes, with pukka stuff you HAVE to use it properly to see what it's capable of and make it worth the money and the time
And the comment about the car washing itself for that price, well no that doesn't happen, lol, but if the wax is used properly, it makes general washing VERY easy and painless, and something you don't really have to do very often
Also, yes, you can make your car clean and shiny with "lesser" stuff, you can make your car clean and shiny with fairy liquid if you want to, but ultimately it's nowhere near as good!
You can do a hell of a lot better than popular brands like Autoglym if you know what you're doing, and without spending Zymol or Swissvax kind of money buy buying very good brands that not many people will have heard of. Like I can recommend just about anything from the following brands:
-Poorboys
-Chemical Guys
-Dodo Juice
-Sonus
But as also stated, you HAVE to use the right quality of cloths and materials with these products to get the best from them
It's just like anything else really, compare it to tuning. You can spend a small amount of cash to make your car go quicker, but the engine won't last as long. Spend a lot more and it will last forever
Sam principle, some people won't "get" why you spend so much time and money on it, others will