To Keep or Not to Keep

I currently own 13 machiens, 10 are antique machines that work, but not all have their bobbin casings, 1 Janome Sewist 521, 1 Brother PC420 PRW, and the question of the day machine the Brother HS2000 from HSN.  I ordered the HS2000 before I found a great deal on the PC420PRW.  The PC420PRW is wonderful and a keeper.  I'm debating on whether I should keep the HS200 which is a great machine and is light weight.  I have coworkers who are wanting to learn how to quilt, so I might end up leading some quilting sessions and could use the extra modern machine to teach with and have for people to use, get a feel for, and encourage to get into sewing if they don't have a machine.  I can afford to keep both, but should I.  I'm personally leaning towards keeping it.  What other benifits could I have for keeping it?  I do plan to do more alternations to my clothes and revamp thrift store finds since my body isn't a perfect size10.  The delimeas of the modern sewer.