If you look at last 24hr volume on coin trades is about 700 btc. There is another approx 800 in the fee shares but I don't know if fees are charged on this. Either way there would need to be a lot of growth to justify price.
Still not even close to justifying the price. The volume is abnormally large due to the fee share IPO trading but I'll be extremely generous and say the site averages 2k btc/day in volume (it doesn't).
2000 BTC * 0.004 (fees) / 100k shares = 0.00008 BTC/day per share.
At the current price of ~0.5 you're looking at 17+ years to make back that money. If you're super optimistic and think the sites volume is going up 1000% in the next year or two you'd still be in in the neighborhood of 2 years. Right now the only value these shares have is the money they're returning, there's absolutely no way of knowing what the price will be whenever you try and sell them months/years down the road. Don't buy a two-day old share in a smaller exchange in an extremely volatile market as an investment thinking the fee returns are just a "bonus". I bought in they day came out and sold shortly after for a small profit because I felt it was a huge bubble at 0.3.
Edit: Don't take this to mean that I don't like the site because I do enjoy it. The layout is nice, the shares are a cool idea, and earning interest is great. The shares were reasonable around 0.1 for the IPO if you believed in the growth of the site, but at this price you'd need 10x+ the current volume to justify it.
I rarely come to this sub-forum but I'm a regular at the Custom Hardware & Group Buys forums - where I offer Group Buy Escrow Coordination services and vetted Miner Host services at 2.5% for 28nm chips - and yesterday was the first time I had ever heard of mcxNOW. 
