I can not answer the question about the Open Houses, but I will try the others.
Most of the listing data that is found on Trulia (for non-for-sale-by-owner homes) is listing data that is migrated over to Trulia from the MLS. Because your property does not show up in the MLS (as well as many other places) your property was not considered when the agent wrote the description of the property for sale. About 99% of the information Trulia has, comes from real estate agents and from the local MLS.
Keep this in mind also: as other potential buyers search for homes similar to yours, they are not only looking at Trulia. There are soooo many places for people to look at property on-line that it is imperative that a seller has as much advertising exposure as possible. With ANY product (including real estate) there is a direct correlation to sales price and time frame, by the amount of advertising exposure that product gets. All things being equal, more exposure equals higher sales price in a shorter period of time. You may not like it, but full-time Realtors can still do that better than anyone else.
Keller Williams Realty