In short Supernet is a huge fundraising by jl777 for jl777 himself. He has thought of a very long and time consuming con. He is not your usual small kind of crook. He's in for the biggest scam in crypto history. He's letting you invest in his own assets and coins which we owns hugely. And when the right time comes he will get rid of them. This is the reason I chose not to invest in this.
Again this is just my advise. Take this as a pinch of salt. After all it's your Bitcoins. Peace.

Supernet is a kind of fund. It comprises of coins which is illiquid and activities are difficult to value. jl777 owns a lot of them, which cannot be sold to market easily. By having this Supernet, jl777 can pump the NXT and sell some of NXT at hypered value. As Supernet is a kind of investment, there might not be any dividend from it in the future. If you own 1 BBR and do not convert it to Token, you will have 1 BBR at the end of the day. If you convert that 1 BBR into Token, it might not worth 1BBR later.