Let me address point one first . . . I do not see any requirement to be 'tier 1' I am not currently tier 1 and loaded my results as well as several relatives. The imports included Living DNA, FTNDA, 23andMe, Ancestry tests.
That the number of contributors is relatively small is true and I do agree with your point of view but will share that I have already had Genesis matches contact me with my results having been imported only recently. As for the total population being small, your contribution will help build that base even if you do not expect much value in the near term.
As for casual users of GEDmatch . . . well, those using GEDmatch are less casual than most but there is also the argument that one does is not well served by matches to persons who do not have trees and do not respond to queries. In other words, the signal to noise ratio is better now than it will be later. I am not saying this is my opinion but there is some validity to the argument.
Long story short, if you don't see value in it then wait. I have already seen results and am glad I did not wait.