Bitcoin is much profitable than paypal 
and i think that bitcoin has a possibility to be the worlwide currency
yeah you are right bitcoin is much more profitable than paypal because paypal is not available in everywhere and you can check that bitcoin is available in everywhere in all countries for shopping etc . and i think that bitcoin has a possibility to be the worlwide currencyThere is no point into calling Bitcoin more profitable than PayPal since PayPal is not an investment option as Bithodler also pointed out. If you relate saying Bitcoin is more profitable than PayPal to acceptance in the world, then you should say PayPal is less accepted in the world as certain countries don't allow PayPal to operate there anymore. Drop the profitable thing.
True. You can't use Paypal as an investment option. Money you put in Paypal will not appreciate or depreciate, with regard to the amount deposited. But, we should also be educated that Bitcoin is not a currency. The US considers Bitcoin as commodity and not currency. Meaning that this is not really money but some kind of item we buy and sell, hence is greatly affected by supply and demand. Unlike money we put in Paypal, since paypal is a financial service.