Obviously I can't tell you definitively without seeing it but If there is only water leaking when the tub is running and at no other time you are likely looking at bad putty or rubber on the drain shoe, possibly a leak in the trap or drain, or it could be a bad pipe going to the tub spout or shower riser. 

Not a bad person, the shoe just doesn't fit.

Basically the wholesaler's advertising is saying "HELLO, I HAVE A CONTRACT FOR SALE (ASSIGNMENT) TO CLOSE ON THIS PROPERTY- IF YOU WANT TO HOP IN MY SHOES AS THE BUYER, THERE WILL BE A ASSIGNMENT FEE AND EARNEST MONEY DEPOSIT..Quick thinking inside the box guy, and stating false statements on things you have no clue are true or otherwise. 

If this is something you think that you would enjoy, go for it, but put most of your money in more passive investments.Just my humble opinion of what I would do in your shoes.  

From my service the biggest lesson I have learned is always find someone has been in these boots/shoes before.  

Can´t imagine what´d I´d say other than that, besides encourage you to stick around here and share your experiences with other forums members - everybody can benefit from your input, whether they be in your shoes, before, or after.

@Jeremy Kleier if I was in your shoes.

If you are buying a pair of shoes yes, you can buy all the materials and have someone else make the shoe.

Then we had a "flood" from where the hose in the back of the fridge had busted and my daughters room, kitchen, bathroom, hallway, hallways closet and my bedroom closet all had water under carpets and the came and vacuumed, twice and i have work orders for that then lastly i went to go get a pair of shoes i hadn't wore in a week or two and there was mold all over my shoes in the closet!

If walk in the buyers shoes we might be more understanding.