Bitcoin isn't a traditional asset, it's a bit more volatile and less likely than some to go back up to a certain price within a certain about of time which is why an index of different bitcoin prices have to be used by futures exchanges... I doubt anyone could run a successful exchange based on the index or last price and allow for 500x leverage without you realistically speculating on about 8 different exchanges markets at once...
If I get any exchange offering 500x leverage than even at that exchange I would not be risking more than $6 no matter how much profits I have so let's assume my buying power would be $3000 if I choose 500x leverage. Currently my buying power is $750 only.
I never care about the liquidation price as always I have my stoploss with me to help avoid excess loss. I have my own strategy, risk management, money management well planned which makes me confedient with trading with high leverage. I do firmly believe you that high leverages can quickly make accounts liquidated but it is not true each time if you are well trained. High leverages can be a lot beneficial if you know how much to risk.
edit: Just like my current position with 125x leverage : http://imgur.com/a/SUfOmuW (not mentioning the image directly as it has my referral id and here it is not allowed to directly post your referral id)
Because I know when to open position and when to close it. I have literally killed my greed & fear.