Amount of allowed structures, is it enough?

We are limited to that number 200. As marines I have never ran into any problems of hitting that number personally. As an alien I have. I don't run into this often, but I had a few stretches of games the last day or two where I was. The scenario goes like this.

We aliens have four hives. We are trying to break the marine turtle. The marines can do more than turtle, they are pushing out from time to time, but we aliens can stop it every time. I have crag/shift/shade at only my two hives. I have a crag/shift/shade at two forward bases to assault the marines from. I have whips to stop marines from pushing out, but they kill them. I have matured whips elsewhere to shift/teleport where needed; a whip rush would be a great use.

One might say be more efficient with my structures. Maybe even send a few into the marine base to be killed so I can place something else. Both are true. I was trying to use the structures to help end the game as my aliens could not.

Is it enough?

This really is only a minor issue I run into sometimes. Why not give 50 more points to play with, 250 total, to play with if four hives are built? If four hives are up marines should be losing soon anyways. I may not of ran into this as a marine, but why not give more points to play with too after having 4 cc's.