Do you 200 dwellers?

I've been playing for a while now, and I could've 200 dwellers around a week ago. But i can't seem to make myself do it.

Currently have 138 dwellers and kept killing the weakest when i'll be reaching 140. My actual plan is to lower my population to 100 or 120 and stay that way. Easier to manage i guess.

I sometimes do a light genocide by letting a radscorpion room with 6 weak people unarmed. Instant minus 6 population.

Am I missing things by not going for 200? What i'm thinking probably is more caps collected?