I don't mind going to an upscale hotel and walking thru the lobby when I visit a provider.  As long as I look like I know where I'm going, and not lingering around, it doesn't matter.  The hotel staff is suppossed to offer good customer service and make eye contact and greet their guests (at least at nice hotels).  They have no idea if you checked in last night or 2 days ago or if you are attending a business meeting, so it doesn't bother me.  I've been to some nice private incalls, and to others where I couldn't wait to get out of there!  For my money, I'm content with a 3 or 4 star hotel.  I think you might be reading too much into the staff watching you - just my opinion.

.....usually even if you have to walk through the lobby they're not really thinking about you especially when it's busy. More than half the time if I have to leave and come back in the hotel through the front/lobby I MIGHT (big MIGHT) get a quick smile and hello amongst the crowd from a front desk staff member and they go back to their business.