Would you rent a $14,000 DAC for $75 per day?

Renting would be infrequent at best and while you're waiting, value is going down, and every time you send it off chance of damage, losing it, theft go up.

5 day minimum.

Another thought, if it comes back broken, who's at fault? Who's liable, the shipper? The customer?

The forum is full of incidents of Lost, stolen, damaged gear, and that's with a single shipping. But, your circus, your monkeys. Weigh out the pros and cons. Develop a business model and liability contract. Are you going to be a tax paying business entity? 

"Thanks for all the brutal replies. Lots of shade..."

@audio_bidder ,

Sorry no one is coming off all kumbaya for you with posts of positive reinforcement, but these responses are hardly brutal. They’re just apparently not what you wanted to hear. This isn’t unsolicited advice; you asked. Also, no one is throwing shade. No one is ridiculing your idea. If you think its worthwhile, do it. If you don’t, don’t do it. Simple as that. If you still think it’s a good idea, set the wheels in motion. Only way to find out, isn’t there. I'll finish my tough love speech with this; To me, renting out a single dac is like owning a car rental business that has one car. 

@audio_bidder ,

I can certainly respect your decision and your drive to succeed.

You seem to be going into this with more business acumen they you have led on. 

If you do decide to go for it, I wish you nothing but success.