@Steve K.
I'm not sure if its new... Certainly increased given the market conditions and the advertising its increased. Maybe its part of the nonprime space as well as the subprime.
I think it might find itself in some strange grey area, because of lack of knowledge or sophistication. I thought owner-occupied Notes were trading well, but had double digit yields. If I understood the Note market space better, I could see if seller financing at ~10% and after seasoning sell off the Note.
Yet, people are doing such a wide range of single digit yields. As mentioned, some people, be they investors or just owners, see how great it would be to generate what they think is a steady income -- just with a huge counterparty risk if they are extending credit to a nonprime or subprime borrower...
As mentioned, using this strategy when you don't have the resources and/or credit to back this is a recipe for a bunch of disasters. No one really advertises this, but you do and can lose money investing in real estate.
Perhaps when there are more defaults, etc that hit the mainstream media, the risks will become more apparent. Otherwise, I think the main issue is "creative financing" still requires "desperate" sellers, those that have a particular massive "pain" that just needs to be relieved in anyway. I find it kinda sad this occurs instead of getting the best/highest value out of their property, at least sometimes I figure.
@Marcus R. You asked about the benefits of this to sellers: I'd just like to add that sometimes, depending on your financial situation/history, outright selling sometimes doesn't have the huge tax hit "they" keep telling you. I've been tracking/waiting for over 20years now that I'm liquidating my portfolio. So, sometimes the "benefits" are from ignorance.
Additional "ignorance" is the seller, especially an investor, is really a one-trick-pony, for lack of better term, and only knew how to invest in real estate rentals. So in the case of a "tired landlord," if you offer them 6%-7%, perhaps, they jump at it because they see it a good return. They don't realize, or can't consider investing in any other asset or asset class and see a similar or better yield/return --- I guess kinda a pet peeve of mine.
So, in reality I don't see seller financing helping the seller sometimes, in the grand scheme --- but it maybe the best they know how to move forward. Meanwhile, it entirely benefits the buyer while pitching how much its helping out the seller.... (sigh)