1) many natural disasters occur that people have no control over (flooding, tornado, earthquake). Once the damage is done, another person expends time and energy to help you fix your problems. This other person has family to feed and rent to pay for, so on a large scale, this cannot be done on a purely volunteer business. As long as they charge a fair ethical price, there is no harm in this. This is similar to a plumber fixing a clogged pipe over which you had no control over
2) it would depend on the time it takes someone to catch the animal, cost of transportation, and time it takes to release the animal. We also need to factor in that the person removing the animal is putting themselves in harms way for someone else so that also contributes partially into the cost. All in all, it most likely takes an hour for someone to travel to your house, catch the animal, and release it into the proper habitat. As such, a reasonable amount to charge would be $25-$30.
3) this is similar to asking if it’s ok to crush a cockroach because it carries diseases that could make you sick. We must see the benefit and cost of each decision to determine if it worth pursuing. Although the animals would be displaced, they are not directly harmed in the process. The indirect harm of them having to acclimate to a new environment could be offset by discussing with ecologists about local habitats for specific animals. For example, if there is a local forest that is home to many porcupines, this would be a fair and ethical place for relocation. A alligator could be placed in a local pond that is isolated from public access. This is to say, despite the fact that in order to reduce harm to humans we have to displace animals, this harm can be minimized as much as possible. In the end all decisions carry costs and there are no 0 cost decisions, so we pick the decision with maximum benefit and minimal cost, which in this case is relocating these animals to local habitats more suitable to them