Copier sales job?

And to add on above: to fellow forumers or persons working in either admin, HR, purchasing, accounts, I.T support role or in your job scope to have encountered copier salesperson during your course of work, it's not like these people are so free nothing to do that they enjoy knocking on your door when you are at your most busiest moment of the day or interrupting your phone call midway to ask for a name of the person-in-charge so that they can better seek more queries, and why are they so annoying asking over and over again the same typical questions like the brand of copier using, how many years in use, any intention to upgrade or change blah blah.

though it is annoying and irritating, try to cut these people some slack and understand that they are being forced in their job role to do that, the companies that they work for are slave drivers.

how many have made it or break it from this copier sales career? care to share insights?