I own a rental company, different industry, but the fear of theft is more overblown than reality. Liability coverage is obviously a must, and I know I would be interested if their was a professional company that rented pins. Price wise we use A percentage of MSRP to set rental rates, and I think something like 10% of MSRP for 90 days seems fair, at least that's what I would pay. Since moving pins is an issue, I would also make it a minimum of 90 days, so travel doesn't tear your machines up. The people saying that others might bash on them could be correct, but i feel like pins in the wild would receive if not the same or way more abuse. We also service our equipment between each rental, so the chances of someone having an issue are slim.