As soon as there is no more money left (or it's low), you must contribute again.

I've had several bids, all much higher than the original, unrealistically low contract price, with of course a lot of variety in the price, experience, and track record of various builders.

These things hold their value amazingly well.If I had to guess, if you bought it for 40k and only used 9 or 10 times, the hours on the machine would be so low you could probably resell it for 35k or better (given that their retail value would go up over three years so the discount from say 48k to 40k might even mean you break even)..

It is all dependent on the numbers.If you are planning on putting low money down, the odds of it cash flowing (or even breaking even) in the first year would be difficult. 

You haven't shared all the numbers, but if that 2nd position note could be at 70% LTV and below and with a shorter say 12 month duration then it's comparatively low risk as opposed to 100% financing for a purchase.

The concept of finding Tenant Buyers through lease options with low equity sellers kind of blew my mind.I do remember seeing Ron Legrand when I was a kid but lease options never really clicked with me.

Low barrier to entry, low risk, high return.

Low energy spamming tbh 

One has a low interest rate loan and the other does not.  

From looking up on Glassdoor or Indeed I'd estimate their tech salaries to be $120,000 (on the low end) to $400,000+ (I didn't ask them their salaries, didn't want to be too nosey).