The vault does not receive directly the request does it. The elders tell the vault to retrieve the chunk the elders specify and that means they apply whatever function to the address that was applied when telling your vault to store it.
Now if the section can receive 1 request per 10 minutes before caching elsewhere covers the request and it averages out which vault supplies the chunk then its once per 80 minutes or 18 gets per day for that chunk on your vault. Now if cache average keep time for the chunk is 30 minutes for any cache in the hop chain then its 6 requests per day. At say 0.00001 safecoin per get then you earn 0.0219 safecoin per year of gaming with one machine.
Now if you have 10000 machines and there are 1000 sections then there is a max of 1000 paths and many of those intersect so average of 10 paths out of the section with your vault. So we can multiple the requests by 10, but we have to extend the cache response time to at least double since there will be multiple cache paths potentially supplying the chunk. But if the requests are not coordinated then it may always be the cache responding even at one request per machine per hour or 2 hours since your 10 machines per hour per path will likely keep at least one of the caches responding.
Now your 10000 client machines will not be perfectly spread out across XOR space so the paths will not he 1000 but could be as low as 100 to 200 hundred paths and this makes the figures worse. In fact too many machines may defeat the purpose and you need to ensure each client machine is using a different path to your vault. But since you cannot know the path then thats out.
Have fun trying up multiple machines for a year to get maybe .2 to .5 safe coin per years (assuming get rewards are as high as 0.00001