The biggest wallet doesn't matter as much as which group has the most members, more money certainly helps especially when you reach certain levels of it but till then, more members tends to be more important.
Actually the homeless do have voices, there are advocates in the homeless community and there are groups that help them spread their voice and advocate for their interests, but you also have groups like home owners and such who aren't really against homeless as much as they just want them to be further away out of sight. Short answer, shits complicated.