Dear hodlers, I have some junk products to sell you, all you have to do is bring in more people to buy your stuff and you have to buy my junk at a premium. Doesn't this sound like an amazing opportunity to buy a Lambo? I will be the first one to buy a Lambo though, you just have to hodl 
There is no organized marketing campaign for Bitcoin, hodlers do not promote it on national TV or mainstream media, some of us might tell our friends and family about Bitcoin, others keep it quiet. Regardless, Bitcoin's growth is too big to be explained by multi-level marketing theory. The reason why it's growing is because more and more people become convinced that it's actually valuable, because it delivers all what it has promised - decentralization, immutability, resistance to attacks, total financial freedom. People are convinced by Bitcoin itself, not by its hodlers.