Man, that is a sweet deal!
I have two basic rules on bicycles:
1. The hobby has to pay for itself (so flip sales must equal or exceed bikes kept, parts spending, etc).
2. To keep a bike, I have to retire (sell) one in the fleet. No fair growing the fleet. And the sale of one I retire needs to cover the cost of the addition. So it needs to be an upgrade, at least in my opinion, to be kept. This has kept things in check.
I did violate rule #2 when I added a Lotus Classique to my keeper fleet, but since I picked it up for $16, I have not gotten any flack on that.