Why are there no enterprising homeless guarding your forbidden items?

Why are there no enterprising homeless guarding your forbidden items?

There are some places you can visit that don't allow you to take certain items with you (for example no knives for example for the Circle line tour to Ellis Island and the Statue of Liberty or no camera or camera phones for example the US Mint in Philadelphia or no food (as well as no knives, and I think no camera unsure for example Congress in Washington DC)

The forbidden items either go into a large rubbish bin (food, knives) or you don't go/don't visit at all, or someone from each party has to stay behind to guard the stuff (usually the case with no camera/camera phone allowed).

There is no place to store your stuff, unlike places to visit in other countries. (For example, if you visit the German Bundestag knives aren't allowed either but they will hold them for you and you will get them back when you exit).

I don't want to debate the reasoning behind banning certain items (like banning factory wrapped American Chocolate Chip cookies in the US Congress) or why they don't hold them for you as they do in some other places outside the US.

I wonder why no enterprising person (a homeless may be?) offers to store the forbidden items for a fee.

All of these cities house lots of homeless persons. Why doesn't a single one of them open up a business and stores your stuff for a dollar? I'd rather pay a dollar than to throw away my pocket knife...Sure, in the case of giving my camera to a homeless person I'd hesitate, but once he has been there for a while and built up a reputation why not?

For example in Egypt, you often have to pay a fee (in addition to the entrance fee) if you want to take pictures. If you don't want to take pictures/avoid the often substantial fee you aren't allowed to bring a camera. Instead, you give it to some chap in front of the entrance and he will look after your camera (for a small fee) and you get it back once you exit.

It works every single time.

Sure, he could run away with all the cameras he is guarding, which may be worth a few thousand dollars. But he can only do that once. Once he has done that once, no body is going to trust him anymore, so he won't do it. Sure, many people don't trust him anyway and pay the camera fee but there are still enough that do in order to make it a viable business.