Really? I could have sworn I only got 100. Guess I'm probably mistaken.
I don't think you only got 100 initial sMerit. You have
given 498 merit 389 times, to 215 profiles ( 2.3 merit/profile). We can deduct your earned sMerit of 232, you have given 266 initial sMerit.
Initial sMerit depends on your activity points.
Exact formula:
yearActivity = activity in the last ~year, max 378
freeMerit = the merit (not sMerit) you started with
modifier =
0.1 if member
0.2 if full member
0.25 if sr member
0.35 if hero
0.4 if legendary
return (yearActivity/378) * modifier * freeMerit
So the most you could get is if you were a Legendary who maxed out your activity points in the last year, in which case you would get 1 * 0.4 * 1000 = 400 sMerit.
Note that I later made an adjustment giving 500 extra merit to some hero members, but no extra sMerit was given here.
I'll probably publish a dump of the initial sMerit at some point.