An espresso machine usually needs to push water at somewhere between 8 and 15 bar pressure, which is quite a lot. And since it is the high-pressure components that are key to how they work, it is the quality and durability of these that tends to set the price point.
The quality of the pump varies from a device intended to be used for two or three cups once a week, all the way to professional machines designed to produce thousand of cups a day, month after month. This is why domestic machines are usually quite clear that they are for domestic use only: they simply cannot cope with the duty cycle of any more than that. Many domestic espresso machines will turn themselves off if they are used to make too many cups in one session - quite simply, they overheat.
It sounds like one you bought is one intended for occasional use. My advice is to visit a couple of retailers that have staff dedicated to selling espresso machines. They will, of course, try to sell you "their" brand, but they will also recognise when someone needs a domestic unit designed for daily use as opposed to one just for special occasions.
As a bonus, you generally get what you pay for with espresso machines. The more expensive domestic ones usually really do last much longer.