It's kind of strange more than anything else. Almost like a trophy for someone. I don't think it's really dangerous, per se, but I think it is kind of off-putting to people considering buying/mining/using Vertcoin - why would you want to use a "currency" when one single address holds 25% of all that exist. It's possible it is an exchange's cold wallet address, but I've had people tell me that's not the case. It would be trivial for the owner to split the massive sum into many smaller addresses, giving the illusion of a broader distribution of the coin, but they choose not to do that, which is why I said maybe it is like a trophy for someone.