EDIT - early this day I was thinking that RaiBlocks and the connected exchange bitgrail.com is some kind of scam.
I have to correct myself - they are not scam but are really shitty.
KEEP IN MIND - bitgrail.com has limits.
If you want to buy RaiBlocks for small amount for example 100$ (~25 RaiBlocks at this moment) in order to test this crypto as I did, you will not be able to withdraw - the minimum withdraw limit is 100 RaiBlocks. So, in order to withdraw you have to buy 100 RaiBlocks which is very high amount just for testing (for me). I should deposit more litecoins in order to buy +75 in order to sell all my shitty RaiBlocks because there is sell limit too - you have to sell minimum 100 RaiBlocks (but you can buy 1, this is why I am calling this exchange shitty and cheaty !!!)
Finally I sold all this 105 RaiBlocks for litecoins and have withdrawed succefully but I lost much because of exchange rates. My advice is to stay away from bitgrail.com and wait RaiBlocks to be listed on some nice exchange if this happen at all.

The high price of RaiBlocks is because of these limits - they let you only buy and not sell and prevent you to withdraw.
They price is pumped this way, it is not real.