Pretty much everything is negotiable in real estate.Loan Origination is how much the lender is going to make on the file (if direct lenders: this is typically a junk fee; if brokers: this is your loan officers compensation).Points: this is the cost for the rate itself (if direct lenders: this can be negotiated, as they manufacture the rate sheet with profit baked in; if brokers: the rate is the rate, you are getting bottom of the barrel pricing).Credit report/appraisal: these are the actual costs -- no money can be made.

I would like to compensate them by paying a bit extra, but what amount is too little and how much would you say is too much?

I keep a little 7.5 cu ft fridge and offer to have my handy man deliver it the same day a tenant reports a fridge out. https://www.amazon.com/RCA-RFR725-Apartment-Refrigerator-Sta...I have our appliance guy out if it's a newer appliance or I go appliance shopping if it older than 7-8 years old.If tenants want other additional compensation, I tell them that it's not my job as the landlord to protect them from every inconvenience; we will provided a compact fridge for temporary use on request and promptly schedule a repair and replacement and they should contact their renters insurance to determine if any additional benefits are available.

Again, other might feel differently here.b) Skin in the game: as a conservative investor, I understand that the dirty secret of industries that the waterfall compensation is in the line with me and incentivizes sponsors to take more risk.

As far as compensation in the form of cash flow/equity, those numbers would need to be negotiated on a case by case basis. 

You'll have to compensate for that with low prices and convincing them that you are young, hungry, and will not be outworked. 

Others will kick and scream and demand you give them three months of rent free.Talk to your renters and get an idea of their expectations, then develop fair compensation.

Then you can both agree on compensation for their time and involvement.   

Not to mention you are now paying workers compensation insurance, professional liability insurance, general liability insurance and other misc. expenses of operating a second business, so it really is dependent on the size of your operation and portfolio. 

You may be getting a pay check, cash flow, or some other form of compensation from the operations of the asset going into your bank account but the asset hasn't generated actual profit to the bottom line until all of your invested cash is out of the deal.