If HTC were able to reward scenario participants with perk points in some form, then it might be a useful tool to help raise interest.
There would have to be a bit of thought put into what the award should be and how it should be earned, but it might be useful.
It wouldn't make a difference to the welded-on crowd but it might draw in some the younger noisy types (has its drawbacks and all).
I noted at some time in the past there was to be an "achievement" reward of some kind included. Did that ever get up?