1. Entry level ball is a misnomer. Balls at this price level are more accurately the least hooking resin balls in a company's line up. It is useful for even the best PBA professional on drier lanes.
2. They are are not made from cheaper materials. They are usually less expensive because their coverstocks and their cores are usually from older balls that are no longer in use. Their coverstocks and cores are on the weaker end of the spectrum available.
3. Usually newer technology is priced higher than older technology. It does not mean older technology is bad.
4. Most times entry level balls will last a lot longer than the higher priced models because their coverstocks absorb oil at a much slower rate. Oil absorption rate is one of the factors that make balls hook. Usually, but not always, the faster that balls absorb oil, the more they will hook. Of course, the faster balls absorb oil, the faster/quicker they lose performance, without attentive maintenance.
5. Almost always, higher priced balls will hook more and require more oil to hook, to perform, than balls lower in any one manufacturer's price structure.