CDs initially were able to fit more music than other formats (well, cassettes could fit longer than vinyl, but at those lentths the tape quality stinks), and to take advantage of this - as well as drum up sales for a new expensive product which was platyed ona new, expensive product - record companies and bands started to put bonus tracks on the CDs.
Contrary to what the question brings up, these tracks were indeed advertised, both in the track listing and often on the cover itself and in advertisements.
Needless to say, as time went on and CDs were not a “gimmick” anymore, the practice was no longer necessary, but habits die hard.
The practice of “hiding” the songs was an added bonus meant to add some creativity to the process of putting extra tracks on the disc. And fans kinda liked going through all the trouble to find a secret track, your complaints notwithstanding.
Some of the more creative things I’ve seen include how Tool put a bonus track at the beginning of one of their CDs (you had to start the disc, then go backwards through the song it skipped over automatically), and The Supersuckers had an unlisted bonus track which was THE ENTIRE CD PLAYED AGAIN AS ONE SONG! This was, according to the singer, “if you played it in a juke-box, you’d be able to get the while album for the price of one song.”
And then there are the usual cases where there’s dead spots (like the OP describes) and skipping ahead to another track - NIN used 69 for this on one of it’s discs.
Ultimately, you are the first person I have ever seen complain about this. Even I didn’t have any problems with them, and I was someone who reviewed CDs, which meant that missing a bonus track made me look really uninformed about the disc.
Yer pal,
Satan
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