In the first case, it seems he's been accused of transferring money into his clients accounts prior to making an offer on a property, to help them qualify for larger mortgage loans/ boosting their buying power so they could buy a more expensive property than they be able to qualify for without the boost he gave their bank account.

I only show a coc return of about 4.5% doing it that way but your total return factoring in the loan pay-down would be about 26%.You could play with the numbers a bit and increase the owners note to boost your return while still keeping it cash-flowing.

He now owns several in the street he resides in because he was tired of them deteriorating & attracting groups of kids etc.He then did the 'rent to own' thing with several of his elderly parishoners & in fact maintains them with a landscaping crew etc.He finally admitted it will be a nice retirement income boost when the time comes.

I also predict that with depreciation deductions I can show a passive loss and get a refund on my 2015 taxes, which will boost the ROI.

Sometimes it's nice to know that a bank or hard money lender will fund a project because it boosts confidence in your assessment of the deal.  

Be careful where you go when neighboring owners are not so civic minded.Low-moderate income housing can be profitable, generally you have a high demand and low initial capital outlay that boosts the bottom line.

Capital improvement boosts me to 95%. 

You just boosted my motivation. 

If there's a potential value add to add another bathroom, you can boost your equity in the property like no tomorrowI've bought such houses since no one wants to buy them and so, you can get those at a discount.

Of course, dumping enough money into something, can get you a huge boost, hence marketing being critical.