Absolutely! I work with law firms and I always thank them, follow up with them and visit them with pastries or fruit. It always gets me in the door and the staff is really happy to get some free delicious food. We must take care of your clients, because we have our competitors knocking on their doors as well. I must separate myself from all other salespeople. A visit with food, a few good laughs and you will leave them with a good impression. Sales people prefer to e-mail or leave a voicemail, I prefer to visit my client's or prospect's.