Tigerairways and Seair BoardMeFirst

Just to compare the rates of different low cost airlines, I usually do the dummy booking. And Seair caught my attention because of the service which other airlines don't have ( I assumed..hehe).

Aside from baggage selection, sports equipment, and seat selector, Seair and Tigerairways are also offering the service  BoardMeFirst. 

But I'm wondering.. what if all passengers availed that service, who will be the priority in boarding the plane? the first passenger who availed that service?..lol.

Is that service really essential? hmmm.. for me its not.