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Does seem like gaming the system rather than legitimate ownership. Depending on what Tesla is trying to do (stated: reward existing owners for their loyalty), doesn't seem to fit the spirit of it.
Also doesn't seem like anyone who wasn't a pre-existing owner at pre-order time should get priority if the true intent was to reward loyalty. (Unless Loyalty == owning another non-3 Tesla... which I could see being their definition)
If people want to pay a premium of a couple grand (a few lease payments) in order to get bumped a few months, more power to them, I say. Personally, I don't want my car that bad.