Well my two bits worth.
I have spawn camped from time to time, I call it strategic base defense, lol, but most times i like to stay back from the spawn point a ways and let the person get up and get moving and have an ambush set up in the most likely route to target. Makes it funner than just killing them when they up.
1. Almost everyone has spawned camp at one point or another.
2. I agree their are groups that will provide aircover and keep supplies going so someone can camp.
3. someone said don't spawn and they will leave, you must not be much of a gv'er, I have seen the same person camp a spawn for hours. Just sitting their and waiting for someone to randomly spawn.
4. How I think the camping can be fixed is as suggested above add more spawn points, but also is to set the map so You can not see the enemy spawn points. This would make it very interesting. The only way you would be able to camp at this point is to get lucky and beclose to a point when some one ups.