Do vibration boards actually have benefits or are they just a scam ?

Total scam.

i think their a scam

Unless the manufacturers can provide evidence their product works, then I'd go with scam.

They're basically a gimmick as far as I'm concerned.

Apparently much larger versions of those use to exist back in the 1970s gyms all around the world. They were a bit different, but essentially they were a vibration machine and the theory was the fat would be vibrated loose for the body to process and expel.

Those machines didn't work either and all the gyms back then got rid of them. How a smaller household model would be any better I fail to see.

The one and only benefit I see from them is that people are using those and other products with the intent of getting fit, so their mindset is in the right place and hopefully they eat the right foods in conjunction with it. Otherwise they're a waste of money, electricity and time.

You'd be far better off with a fitness video or even step aerobics, which are kind of the same ilk. Both of those will get you fit and trim with regular use.