I'd Like to Hold an Open House but...

I recently received an email from my broker reminding all agents that the City of Frisco has a sign ordinance on many types of signs, including open house signs on weekends. You may no longer put Open House signs on easements, medians, right-of-ways, or entrances to subdivisions and neighborhoods.
As a dues-paying HOA member in my own neighborhood, I think it's a bit over-the-top to limit signs that are present for a few hours on a weekend. Is it really doing that much harm and causing home values to plumet because of a REALTOR trying to do their job?
I know I appreciate many of the signs I see at the entrance to my neighborhood. Ads for festivals, voting, board meetings and services are helpful and keep us better informed. I don't like it when the sign is there for two extra weeks after the event has already taken place and think they should be taken off within a day or two of the completion.
Maybe I am just crazy!