First of all, lets not throw 'rep quality' around all willy-nilly...the bloke was picked in 1 test match as an 'up and comer' and hasnt returned, and has averages around 20mins/game in origin. If thats rep quality, lets throw $600k+ at Aaron Woods or Tony Williams...
He is certainly our top forward, but he is not being used right and based on the 3 year deal that just went to Mary (a graduate of the Steve Price 'Make-our-best-prop-dance' Academy), I'd say it would be at least 3 years before he hit any sort of potential under us. Thats $600k+ wasted when it could be used for 1-2 blokes who can get us moving in the right direction. We cant bank on the fact that Merrin will reach his potential under Mary, and frankly I cant see it happening.
The reason he is worth 'more' to another club is that, well, he isnt worth more. Not under the salary cap anyway. Roosters can pay him $400k of cap money and another $400k in dodgey TPA. So whats his value? Is it $800k because thats what we'd need to pay, or $400k because thats what hes actually worth to their team?
In conclusion, the reason i am not losing sleep over it is that there are far, far worse issues at the club that would make me lose sleep!