Historically, all-inclusive holidays were something that only the fairly wealthy would go on. They are often priced quite a bit higher than self-catering holidays and therefore sometimes out of reach for many of us.
You can now book an all-inclusive holiday for not a lot more than self-catering in some instances and actually save money on your overall holiday. With an all-inclusive holiday package deal you will usually not have to pay for drinks, snacks and breakfast, lunch and dinner (the drinks may be limited to local spirts and wines). Also all-inclusive resorts often have a good selection of entertainment on site including at least one swimming pool. With this in mind, you could easily go on a week or two week holiday and not really have to spend anything.
This makes it a lot easier for families to budget as recent research says that many families spend more when they are on holiday on food, drink and entertainment than the actual hotel and flight costs.