I am leaning towards buying a ticket and attending the event, but just wanted to confirm with some people who may have been before that it is in fact worth the $300?

Now, one of those things, depending on your personal worth is you might want to form either some type of corporation or an LLC to form that will protect you personally and put you in a tax advantage.  

Is it worth $750?

In general,newer is better.Unless you're talking about historical homes in special historical neighborhoods,a 70 year old home is gonna be worth more than the homes pushing 100 years that are probably long overdue for massive repairs and remodeling (new plumbing,rewire the electrics,new roof,water heaters,etc.

With that said, I have a house off washington, that iv lived in for 3 years now, I am all in for around 1050 a month, my upstairs pays 1100, and for the first few years i had a roommate for 350, which covered heat and cable, so I was happy just living 100% for free, it wasnt worth packing another guy into a room and wrecking my quality of life for an ever 350 a month.

It has some nice office space, loading docks, etc 10 minutes from Downtown Ft Worth and 20 minutes from DFW Airport.

With a small, local bank still holding a mortgage and now an REO, you might have a shot, but these are so rare that they're not worth the trouble to try to find. 

Taking a small loan to add a greater value to this property is good debt and will increase your net worth.  

He doesn't want to deal with it and will carry the note to me for $200k (its worth $250-275).

It might also be worth leaving a note on the front door in case they come around.Last note, if they say they aren't interested in selling just make sure they keep your name and number in mind for whenever they change their mind.