Not only are the less than ethical copier sales people in the world, there are just as bad Lease sales people. When these two parties collude together the customers best interests are never at the top of the list.
You cannot assume that the good Lease sales rep you work with has the same personal value system as the competition.
You cannot assume that the good lease company you work with has a good local sales rep.
You cannot assume that at the end of the lease, the Lease sales person you started with is still there at the end. The end of Lease Sales person, might be friends with your worst competitior and is secretly feeding him confidential information.
You cannot assume that your entire lease database is not sold to a 3rd party competitor for quick cash. I know, I bought such a list for $1k with 42 pages of lease details.