I wouldn't quite understand the logic here. It doesn't really take much extra effort on innos part to make the offer to everyone on a specific world. There has to be a reason why they chose to single some out. My thinking is this, if the offer alerted said high diamond player that he was one of a 'select' group of people receiving said offer that would make him more likely to buy, he would know he (she?) had a huge advantage over even other diamond players. But if the player had no idea the deal was only for him, it would do nothing to persuade him further.
If that were not the case I would be more likely to think this person would fall into the infrequent diamond buyer category. Maybe one who has been shown to make rare but large purchases. Something would trigger in the game that this elusive player has come out of the wood work onto a new wold and the game had the ability to entice this player to spend a lot of money. Maybe like a sort of goldilocks thing, if he spent a ton they know they don't need to entice him with offers, if he spent nothing they know not to bother but maybe he spent just the right amount.
I do think it is unfair and an offer like this shouldn't be for a select few. Saving money on a research pack sure a huge in game advantage not so much.
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