At present situation government actually not so much concern about such kind of currency for that reason people are not so much interested for using this currency. it is now use as a electronic currency though computerized system.
in terms of purchase and sales bit coin holder's are safe but the lack of proper monitoring system by implementing different protocols client are demotivated for using this currency on investment projects.Every country's government should established a policy for securing those client who are holder of bitcoin like an cash or deposit account holders and this types of policy help to motivated bitcoin holders for investing different sector for establishing new entrepreneur in order to development of economical condition.
Well i think it is still a safe investment even at this moment whereas it is still not yet legal to most of the countries. Let's make it clear, being not legal won't be always illegal. Bitcoin maybe is stoll on process of observation on countries where it is not used as a currency for transactions. But still it is a safe investment I think based on my experiences.