We're not hip enough to not have any sponsors. One year our club had Domino's Pizza, a maid service, and a local brewery on our kit. Give us a small discount and we'll totally sell out to the man.
Personally, I think the only sponsors that benefit from being plastered on a kit are ones where the cyclists may use their services. For example if I ever do get hit by a car I have to look no further than my jersey to find a lawyer. One of the guys we ride with owns a construction company and sponsors another club; this typically gets him 2-3 jobs a year from other guys in the peloton. For some brewery trying to sell their IPA, not so much.