You got a bargain, given historical realised volatility, IMHO it's worth about double that.
He did get a good deal, was only because it was on behalf of a relative of mine who wished to hedge a small amount of his coins incase BTC value remains the same or crashes.
This was a one off deal.
He was going to sell 10 BTC for £1000 but decided to do this instead so technically if the option is excercised he will make an additional £600.
I do not believe BTC will crash and neither does he, but he actually will make more money overall if BTC does jump over £150 - so hopefully it will and be win-win for all parties
He reads this forum but does not post so I am conducting this on his behalf - I also hold the 10 BTC in my posession until the end of this also.