I've tried this...it is ultimately terribly time consuming and unsatisfactory. It works great for synthetic masks that can be easily cleaned, or latex masks that can be easily re-cast for a relatively low price...but not so with precious hand made leather masks.
The only way it works is if you have a LARGE stash of masks dedicated solely for rentals. Let me tell you, leather masks are porous and they get beaten up pretty quickly. Actors sweat, and wear make up and many companies (no offense meant to the theatrical arts here...I'm just speaking from experience) are less than careful with masks they don't own. They get flexed and stretched and soiled with oily fingers, trodden upon. They love white masks (because they look awesome on a stage) but white masks get beaten up so, so easily. Once the masks get beaten up (and one production can do it if they aren't careful), the masks are not rentable.
So you have to get the company to sign an agreement stating masks will be returned in reasonably fair condition (which they resist, and will argue bitterly over the definition of the term "fair condition", and 9 times out of 10 will not honor the contract), you have to (often) physically go GET the masks when the company is done with them (or risk losing them because small productions fold up overnight) and you have to spend a considerable amount of time refurbishing beaten-up masks. You also have to be prepared to throw away a lot of masks, NOT just leave them with the production that wrecked them. If you do that, you send the message that your masks can be owned for the rental price. It cheapens your art.
Of course you will be ~killing~ yourself to keep the rentals pretty in spite of the abuse, because who wants to allow shoddy ragged examples of their art to be seen in public? So you work 10 times as hard to make a fraction of the money. In my opinion, not worth the money or the effort or the time (not to mention headaches and heartbreak). A serious, professional company will always purchase rather than rent (it'd be like renting make up! Who does that? You have to own it.).
You might think it would be great publicity for you and your work, and it is...to other small companies with no budget who think they can get a bargain. You assume all the risk, they get your masks, and once they have them you have no real control over what happens next...and you've just sent the message that your unique, fragile fiber art can go for cheap.
I save my effort and my BEST for the best, only. If something small comes along that I really truly like and believe in, and I think the company has real vision and talent, heck...I've been known to practically give a mask away. But to become a rental for leather masks is, in my opinion, a losing proposition.
