You may not like what you find.

My own experiences suggest that the used medical equipment market (and there
is such a market - a global one, in fact) can be frequented by some decidedly "dodgy" characters. Even the "charity scene" can be a bit
murky, or so I have found.
In short:- used equipment dealers and decent biomed techs are not a good mix! Chalk and cheese, in fact (or perhaps I have just been unlucky).

As I have advised many others in the past:- far better to stick with the honest business of equipment tech support. You won't make any Big Bucks, but at least that way your conscience should remain clear.
On the other hand, if you have Mega amounts of money (to risk), and are prepared to shrug off any ethical questions that can emerge ... then go ahead!
