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From an engineering standpoint --
All vibrators and bullets work by spinning a weight. The simplest example is to have a string with a washer on one end and spin the thing around - your hand moves around with weight. A vibrator just does this *extremely* fast, so it can feel like it's shaking back and forth.
This weight is usually metal, and is usually encased in plastic. Naturally, metal is stronger than plastic and inside of the vibe, the metal is hitting the plastic just like the vibe is hitting your clit. Since the plastic is brittle, the concentrated stress at corners/ends will cause it to break eventually, wherever the joints may be located within the particular model. If it is not the plastic breaking from fatigue, it is probably the power switch or adjutment since the repeated stress of turning on/off can damage the electronic connections similar to bending a paper click back and forth until it breaks.
Pretty much all engineers these days are either taught in school or told by bosses to design failure on purpose. After XXX uses, the product will fail. This is so the company can continue to sell products, and spend less time and money on design. If it is breaking after an average period of weeks with the same use, it's one of the previous problems. If it's breaking because you're using it in one session until the batteries run out and go get more juice and start up again, it's probably the motor.
If you want something that will last a very long time, it will cost more. Things to look for -- all metal components for the weight, shaft, motor, and sturdy attachments of the metal mechanics to the outer plastic/silicon shell. Qualities like these don't seem to be readily advertised, probably because most don't have them, and very few sex toy reviewers are likely to have degrees in material mechanics and know what to look for. Reviews that say "I've had it for a yr and still going strong!!!!" rarely say how often and for how long they're actually used and the actual wear and tear between your use and theirs could be the difference between a Granny's grocery car or a trucker's cross country rig.
The cheapest thing I can think of after reviewing a few major adult websites with a similar function are the Acuvibe or Hitachi Magic Wand. Both of these are <$50, and are designed by major companies for years of use as massagers. Unlike novelty "massagers" that are really only useful as a sex toy, these actually are real muscle massagers that happen to work extremely well as vibrators. Too powerful for sensitive parts? Use a light dimmer switch to adjust power accordingly. Downside - they're large. Over the course of a year I'd imagine you'd save money compared to batteries and a cheap one.
I hope this helps.
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