What's the word?

Some of those aren't things people would search for, and some of the rest will be so little used by others that you can pay very little. Others may be pointless to advertise.

Is someone looking for "music" going to be glad they found your place? They're probably looking for music events, and a background stream of music isn't a music event (*everyone* has that). So, it's pointless to spend a lot of money for a "music" ad unless the music is the whole purpose of your listing. Jazz, on the other hand, is specialized enough that you can probably get placement for "jazz" pretty inexpensively.

OK, I'm sure I threw in keywords in there that weren't necessary while I was trying to make my point.

The point is, even if you're searching on only one keyword and only returning two results, every entry in the database amounts to more storage, and yes, it will increase the load on the database required to perform a search, in the long run. If everyone's classified ads increase from one to five overnight, assuming for the sake of argument that we're talking about a million listings that are suddenly ballooning, that's going to mean four million extra classified ads just to serve the one million ads already in the database. Talk about gridlock.

Just the way I see it.