I rarely ever post anything on my FB business page. In hindsight if I had to over again I would never have gotten one. Just doesn't seem to do anything. I have also liked I don't many peoples other business pages, but that's the one and only time I ever see there page. On the other hand, I have gotten many jobs and referrals over the last year because of pictures I post on my personal page. I think it is fine to use your personal page to show off your business, as long as you don't get to spammy. I have also gotten calls from other people in other states looking for someone to clean a roof, or house, because one of my friends shared a picture I posted.
When used properly it's just not marketing tool in the tool box, IMO.