As with all bedding supplies, the quality of the sheets, pillow cases and comforter covers in bedding sets will vary from maker to maker depending on materials and workmanship. Whether you would risk buying a cheap bed in a bag set depends on what you will be using it for.
If you are planning on using the bedding in a spare bedroom that gets minimal use, maybe a few guest per year, then clearly it will not be subject to the usual wear and tear that bedding that’s used every night will.
In this case, it will be washed less and will maintain quality for years ahead. So, unless you have your heart set on providing the silkiest comfort for your guests at all times, you may find that a cheaper brand will fit the bill.
However, if you have decided to change your current bed linen for bed in a bag sets that will receive nightly usage you will be more likely to raise the budget and go for one of the more luxurious sets. We are, after all talking about your personal sleeping comfort. You may opt for high thread counts on the sheets and pillow cases, not willing to consider anything but the finest Egyptian cotton and you will pay a premium for this level of quality.
The different designs will also affect your decision. Some of the cheaper sets may have very basic designs. But if, for instance, you have a couple of children and you want to brighten up their bedrooms with a kids bed in a bag package to refit both beds, then they may want a cartoon character or something with a special theme. Here again, you may pay a little extra for the extra design features of the bed linen.
Consider the intended use of the set before deciding on your budget and this will stand you in good stead for making the right purchase.