It's easy to get abuse protection for that: If an account already has the mount, reset the drop rate to the default and keep it there. So, if you are in a group and lucky again, then you could trade the mount - I did one friend of mine that favor a couple of times - but it would not be happen as often as you could sell runs to others and make a fortune.
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I see this mount at least once a day. It's not that rare anymore. And I have been farming it for weeks on multiple alts since the end of MoP (sometimes more excessively than other times). I am quite sure that I have reached about 100 kills on all my characters, and with the droprate of 1% this should be the threshold.
The main difference: I am not a spiteful person and I like to share my joy with others.