Weak springs...not recommended for over 150lbs

Have now tried all the "S" brands including Serta, Seely & now Sterns & Fost...it seems like all the manufactures don't use quality metal in their springs that is resilent like in the old days. Beds used to be made so you could "flip" them...but not anymore...this is "progress" I'm told. Now the idea seems to make them quickly wear out so you can be a "repeat buyer" & fill up more landfill space. Had this King K-land "Hope Bay" from S&F for approx 6 mons now...Cost $1,300 (including Cali's onerous 10% sales tax!) to have delivered by Costco...but it's already struggling in the support dept & i quarter turn it every other week. Will prob only last another year or two before it becomes too uncomfortable to sleep on