I really feel bad bad for them. Imagine being so destitute that you have to go around collecting in shuls. Nebach, how I feel for them. They have no morning, no night, just rush, rush, all day to put some pittance together so that they can finally fo back to their families. I really feel bad for them.
I give them whatever I can, and when I don’t have or I can’t, I simply smile warmly at them and tell them (or gesture) that I just don’t have any money.