I was not a curb hunter until a club hunt on a local college campus in late 2011. In two 100 foot curbs on a local college campus four of us found 2 Walking liberty halves, 2 silver washington quarters, 8 Mercury dimes, one war nickel, silver hair beret and 30+ wheat pennies. We later discovered that this was a hangout in the 40's for guys coming to visit the girls (was a girls college until the 80's).
I started hunting curbs in my area in January 2012 with great success (60+ silver coins last year from curbs). Not every curb has coins in it. Look for the side people park on the most.
I have only had one homeowner show concern and I showed him how I didn't leave a mark. Many times it gave me an opportunity to meet the owner and obtain permission to hunt their yard.
Two such permissions for 1815 and 1910 homes have led to continuing friendships along with many neat finds (WWI 371st Regiment Medallion, SC Civil war button, first Barber quarter, first buffalo nickel, 8 silver dimes, V nickels, IH pennies, wheaties, other neat artifacts).
Other meetings have led to owners allowing access to their multiple rental homes in the older parts of town, which also led to great success.
You have to be polite, careful to not leave a mark (especially in a well taken care of strip), sure of yourself, and ready to move on if asked since they do count the strip as in their yard.
Several of my friends will hunt curbs, but others won't. It is a personal decision. In our area there aren't many old areas to hunt, that is why we gravitated to curbs.