You are clearly ahead of where I was with that since you are on Bigger Pockets and I didn't know a thing about this site or local REIAs or how to buy property other than paying retail for it.

They may have said okay to the roommate they will sublet but his name is still on the lease so to you the third roommate is still responsible and when you send notices include that individual.

Notice the one on the cell phone communicating the bids?

Even if a property was a stinker when they bought it in the wrong cycle they have the power to hold on until the cycle gets high enough to drop for close to full value.I would just be cordial and say " Hello, I noticed your property at XXXX address shows you are the owner is that correct??""

Noticed you had already purchased / sold 4 ..

And I can always come up with an answer, and it's usually: "because I'm looking where no big, smart institutional investor bothers to look [small cap stocks - not worth their effort] and where your typical investor is too ignorant, stupid, or fearful to notice the bargain."

I also noticed when building PPC campaigns a lot of $ is wasted on clicks that are of no substance.

If you are deceptive and believe getting ahead means taking advantage of others than you will get yours someday.

That could change in the future without notice.

I think a 30 day notice to quit would be best.