The reason you can't get locked down on how to price a note is the carrying cost are different across states and price models are vastly different between performing and non-performing, first, seconds, and CFD. The 10bii cannot tell you how to price a NPN or CFD. The 10bii is perfect for performing paper and subject to deals so long as the borrower make every single payment. If you must foreclose that 10bii does not assess your exit options as a rental, or sell at auction, etc.
We both follow Scott. He is focused on non-performing first liens and land contracts. The 10Bii is not going to help you make that bid. You need an extensive spreadsheet that factors: cost of capital, foreclosure cost, back taxes, forced insurance, loan service fees, existing code fines, water/sewer bill, cure code fines, recording fees, borrower outreach cost, and many more fees that you will learn along the way. Additionally, your monthly expenses must cover the duration of the FC process which can be 6-18 months plus the redemption period. This is why I don't win many bids.
Most of the folks that follow Scott Carson want to get the note reperforming, but you absolutely have to factor other exits especially when OPM is on the line.
If you are @Dan Zitofski, you are buying a first lien NPNbecause you want the property as a buy, fix, and seller finance to an entity. A 10bii alone cannot calculate Dan's ROI. Perhaps a napkin, but not a 10Bii :)
If your bidding on performing paper then the 10bii is about all you need, but you still need to know the legal cost to take your asset back. If your P&I is $250 and the loan service is $25 your cash flow is $225 and that needs to be factored into your 10bii. You paying the loan service fees is common with institutional performing paper.
Where can you go for price models? No one gives away a fully decked out ROI calculator that cover multiple state on NPN/NPL/CFD. The revival brothers have a product that helps price notes, Scott's note buying blueprint course has 3 exit strategies and is pretty easy to modify, @Dave Putz is working to bring his ROI calculator to the market.
Few have been transparent about a process to price a NPN first lien than @Scott Carson. He has at least 15 videos on the subject at weclosenotes.tv
The bottom line is not one can tell you how to do it because everyone has a different buy model, different exit model, different asset type focus, different state focus, different risk tolerance, different objectives, and different cost of capital. You either pay the trainer, bring the capitol to a Joint Venture deal, get close enough consuming free content, or only focus on performing paper.