Now since you mentioned Property lines of Credit or Business lines of Credit are we talking about Credit cards?  

That was my rookie mistake to not vet the actual sponsor better.  

I would open up a few more credit cards.  

I am still a rookie in real estate investing and am looking for some insight.

I worked in casinos dealing cards, while I don't have any type of security or police type background I grew some thick skin.

Then what happens on paper a property looks like a cash flows very well, then when you add in vacancies repairs and life in general, they end up having to start using credit cards to pay for things and get caught into that spiral To answer your original question most real estate investors are not buying a property every year.

But they also have limitations: can't have a debit card, can't do mobile deposit, may or may not allow wire transfer.

I hope you can make me smarter in this regard. this is not correct -- a person, or parents of a minor, have to apply for the Soc Security card number. 

Of course as nature of things the community of investors in my area that are investing in the US is small and no united network of investors exists.Couple of days back a large conference of investors took place and I mingled with everybody and handed out business cards and managed to assemble 20+- investors to open a REIA. 

I love this strategy, it makes so much sense for Rookie Investors trying to scale.