We bought our bed from some acquaintances for £70. Bog standard pine bed frame - our new mattress. Bed frame collapsed after three weeks, and not through any fun misuse, before anyone says so
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I told my aquaintance who sold it to us (sold as "in perfect condition"), and she said "Well - it lasted us 6 years so you must have been doing something wrong to break it, or been too heavy"
Yeah - like sleeping in it. I weigh 9 stone and my partner weighs 12, so we haven't CRUSHED it to death, surely??