For Sale Ads now Close 30 days after last posting.

Just wondering about ads that are on here like fuel adapter for flip top gas cap,dual exhaust transmission mounts,speaker mounts for dash spekers,fuel tank lock rings,head light relay kits ...that are old posts that have pages of info and only come back up when made or back in stock....I kind of like the 30 day since posted idea but what keeps someone from bumping the ad to forever...I got no beef for the ads and no solution .But what about no bumping and I guess the items list above will have to be relisted..