Imagine that some respectable country would go far beyond legalizing cryptocurrency and start one of its own. It would surely be no scam and it would probably have a strong support, but would there be any drawbacks to the currency and the state itself? Would it get more attention than some of the biggest coins now?
It depends if the coin developed by the government has value. If there is no value, I would not go for it because I do not want to waste my money. But if that coin is very potential and has ability to grow, then why not. However, this would be complicated case because the government may put tax in that coin.