IIRC, MLMs are only illegal if they pay commissions based on recruitment of other members.

If an MLM pays commissions on product sales (either directly or through your recruits), then it's perfectly legal.

A tip to anyone thinking of starting an MLM scheme: if you ARE thinking of building an MLM scheme around your product, you NEED an MLM-specialised lawyer to validate that your scheme is legal in each of the jurisdictions you plan to operate in (most likely, US and UK).