Are zero contracts a good or a bad idea?

zero hour contracts are absolutely ridiculous... I think this because if you have a family you wont be able to see them as much as you would want to because the zero contract is if your company have a job for you, you have to do the job everyday so what this means is the contracts may be for  2 day period or even more.
in addition to this is that the income would not be very good so what this means is that your bills and taxes may not be paid off in time which could lead to you being force to get out of your property and be homeless. Furthermore the fact that the contract is at any time is really bad because if you have booked a holiday with your family, the contract may be within that time and it can cause difficulties with re-booking, getting your money back or not going at all.