Is melt and pour soap like rebatch soap?

You want to buy soap for $1/bar (say). Then you want to put out some hours and energy to alter it's shape so you can repackage it into the wrappers you'll need to buy, after you remold them.  So you can sell them for $1/bar or even if it's $1 profit/bar. That's not actually business, you'll do better flipping burgers.

Melt & pour is generally glycerin soap.  It's cheap.

You can buy a bar of glycerin soap for $.99 in any grocery store or drug store.

Glycerin soap will not appeal to anyone who objects to synthetic dye or synthetic scents.   But with artistic composition (like colors within colors or mosaics), pretty packaging and clever marketing, yes, some people will buy it.     It's way, way, way cheaper to produce than a high quality cold process soap.

Selling soap online is a tough gig as people want to smell and touch it first, plus it's pretty heavy so people balk at the shipping cost.

you can't effectively make money that way unless you are adding value somehow ... the usual way is naturally occurring scents. [example: brother in law's sister in law has a lavender farm.]

Well, you're not MAKING soap*, just recasting existing soap, and yes, some people go for it.

*In the same way that buying a precooked, premixed pot roast and veggies and putting in a slow cooker isn't "cooking", it's reheating.