To put my 2 cents into this, I do not mind that much that there is medical bills for when you get killed of in free roam. But having to pay medical bills in activities where the point of the activity is to kill people and or get killed yourself is just plain wrong, having to pay each time your wasted in deathmatch is just extortionate.
I've only played I think deathmatch twice (I did not know that you had to pay bills at the time, until recently I was wondering where my money was going) and in that I probably died anywhere from 10-15 times.
They need to patch this right away to at least reduce or cut the medical bills completely in the activity where the goal of the activity is to kill or be killed.
edit: now I stick to missions that most of the time can be soloed, so I don't have to worry that much about medical bills except for the occasional death I get from someone in freeroam.
Also if you get a good mission that is doable by just yourself you could just keep replaying it to gain massive amounts of cash and xp, then wont have to deal with loosing money for medical bills by freeroamers or those other activites.