Let’s see … uhm, maybe because pvp immunity would be the total opposite of what the lore is about ? Dystopian and Darwinian are the words that come to mind. No one escapes.
But back to your OP. (1) Any suggestion that crosses the “no gold ammo” line i.e., spending cash for ingame benefits affecting basic EvE gameplay causes the playing field to become unleveled. In a game where losses are real, that makes a huge difference in the experience of the “harsh but fair” factor. If you’re curious about its effects, there are plenty of games - and new ones like (Eve) Frontiers in the making - that will demonstrate that for you. (2) Even without the plex requirement your suggestions have no merit. (3) Making sensible suggestions is the responsibility of any forum poster, and that requires knowledge. You (should) have enough knowledge about the game and its community to avoid “hacks for cash” suggestions.
All in the assumption that you were being serious, of course.