Can someone please explain...

[Survivor]

...how Ticketmaster works? I am trying for fairly decent seats...not on the floor...to the Bossier City, LA venue. I called the arena yesterday and they still have good seats available but can't sell them over the phone.
So far...all Ticketmaster is offering is floor seats....in the very back...or nosebleed sections in the upper levels.

I have MS and can't stand through the entire concert therefore floor seats wouldn't benefit me in the least.

I guess my question is...does Ticketmaster release all of the seats when they first go on sale and this is all that is left? Or do they release more seats closer to the concert date.

I know this may be a stupid question...but I am from old school of the days when we camped out for two nights for great tickets.

Thanks for any help you can give me.