I've been kicked for baseraping. I've also been kicked into spectator for it...even on capturable spawns. After that I've made a point of reading the MOTD while connecting to see if it's allowed or mentioned.
If the server explicitly says "no non-capturable spawn camping" I'll generally avoid it in terms of killing enemies. I'll ignore them and let them run out unless they shoot at me - sometimes I'll let them shoot at me. But I'll ALWAYS attack turrets deployed in the enemy base. I don't give a fuck...they're fair game....especially if I entered the enemy base in disguise.
In the overall sense I agree that baseraping is a viable attack to ensure victory and there are counter-attacks to baserapes if the team rallys and works together....so I have no issues with it. I tend to think of it as a learning experience.
The only real counter argument I can give to that is that not-allowing baserapes or easing off a baserape is to help prevent rage-quit and keep the teams relatively even. If I'm on a baseraping team and it's gone on for a while I'll usually suggest falling back. And since most players in this game aren't idiots they'll lighten up a bit (or even giving the enemy the first objective for free) to keep the teams going into the next round. Only fagg0ts disconnect in the first match...you can still win the campaign....so perhaps that's what server admins are trying to accomplish. Dunno really.
But yeah...baseraping is why the designers put anti-artillery and defense guns in the non-capturable bases and it's also the reason Splash Damage removed enemy vehicles taking damage before they were used by an enemy player.
Regarding team shuffles with stacked teams, I think reshuffling randomly or by XP doesn't really get to the heart of the matter. I think the system should reshuffle based on rank. I've seen too many teams full of generals boot-fuck a team of recruits.