SirMoby - most of the LL owners do look for the dupe IPs in one way or another - some with the built in checker in Link Admin, others have their own special coded scripts as we have been hammered with "groups" that try to submit up to 30 or 40 sites per day by varying the IP subclass, names and domains.
That said, arrangements can also usually be made as Ramster mentioned for trusted WMs that are doing what it sounds like you want to do
If you take a look at some of the archives of the "other" boards out in the industry, there have been numerous people that advertise themselves as professional submitters to make a living off of doing others drudge work, the only problem being that they usually use autosubmitters and dont even attempt to follow other rules since they never read them