Thanks Escobarr,

Can you tell me (ball-park) what percentage I am going to lose on the sell/ conversion back to USD ?

I am now starting to see what the main issue is with these cryptocurrencies. It seems that it is very easy to buy them with "hard" currencies (such as USD) but there is a real reticence to sell the cryptos  back to USD. 

It is starting to remind me of HYIP markets of the past.