They've stated that they plan on bringing 500 Th/s online by the end of the year. That is a valid possibility. If they did and they controlled 5% of the network, then the network hash rate would be 10 Ph/s. I think it's more likely that Labcoin will have 500 Th/s online than the network will be at 10 Ph/s by the end of the year. If the network was at 5 Ph/s then LC would need 250 Th/s. If they get their problems sorted and hit their targets they'll have around 200 Th/s in November.
They'd still need to keep up with that, though. Right now they can't even keep their rank on btcguild.
I'm simply pointing out that these are Labcoin's stated targets and that these targets are certainly possible. Whether they'll hit them or not is not yet a knowable fact, therefore it's an opinion people should form for themselves. That is the risk, which is just as much a factor in LC's share price as are its current dividends. You can't determine the share price from just the dividends like vela is saying.