However, rent you receive from real estate held for speculation or investment is not subject to SE tax."

It is speculation but I think it may increase home values in the area as well. 

Would it be speculation to expect another 100k in the ARV or is it supported by comps.

It was a very lucrative strategy that we enjoyed for quite a few years in the old days.But they started restricting us with a 'speculator clause' & in the spec condos they restricted rentals, Consequently, it became an cost issue having a partner move in for the 12 months 'seasoning' period.If it was available up here I would definitely be into it again.

I don't want to speculate as to what the process would be in your situation, but I would definitely ask prior to you entering into an arrangement for the money.

Again, I don't know for certain...just speculating, and just based on the rules in my state.

There will likely be larger price drops for properties in areas that are more iffy or prone to speculation.  

You don't want to speculate by making assumptions based on news you've heard.The better question to ask is: Is it a good rental market now, and can you find good investment opportunities today?

So essentially, I speculated and exposed myself to become a casualty of the real estate downturn in 2008.

so pulling trigger but my partner/hubby is of the opposite spectrum (speculative) so between the 2 of us, we strike the RIGHT BALANCE.but its a constant battle. my objections and his eagerness.