Tbh I don't really care, cause any real gun fighter realizes that staffs can't stand it when someone knows how to use their gun, the run and gun strategy! I absolutely love when lui comes to one of my bases to PK cause it's back and forth, he's the only good staff user I know that can counter me...
Next, as mischeif mentioned it's not going to change anything about PKING at all, the only people staffs are PKING are a bunch of afk/checking the menu/sleeping at bases noobs! Those same people are still going to die if they have 100 hp and those people who actually pay attention aren't going to die, so now your thinking well isn't that unfair? Well you have 100 hp aswell! Just like if you had 50... If you wanna get a player count up by adding 50 hp to everyone knock yourselves out... Anyone with an era mentality knows not to afk in a PK area and there is no sleeping in bases (maybe gangster zone but that's a different story)
Finally, I will admit 500 hp flags going down with the damage wouldn't be bad and that I admit would make basing fun, although some may not like that because of the damage:speed ratios, but it can be tested