Used Cameras.What to look for?

[RJSquirrel]

Im looking at some used cameras bec I cant afford what I want new. Particularly, a used Canon 1d Mark IV offered by our team photog here where I work. He says he replaces them after a few seasons bec the shutter speeds arent fast enough for freeze action stills as he takes close to 100k pictures a season. Maybe one can esplain this to me in better fashion. The shutters wear out?
So best guess without prying too much and pretending I know more than I do, That would equate to over 200k thousand photos being taken with the camera.

My question is... is the damn thing worn out? Is it too much camera for orchids which dont move? Is a lens that compliments the camera and orchid close-ups going to be cost prohibitive for one on a tight budget? Its going to take me a few months to save up for a lense worthy. So I may be lenseless for some time.
That sucks I just dont have the cash to go get what I want. So Im left to deal with used gear. Pro Photo people take good care of their eqpt bec thats how they make their living so I have no fear its in good shape.
I just want to hear what anyone thinks about this .Im torn between a middle of the road camera with a better lense and now this.......help!!!
I appreciate your replies and comments and it will help me decide..Im on the fence right now and its green everywhere


oh he only wants $2500 for it