Funny thing, is I did this years ago when my cheap lawyer sister bought a house. She makes $100k a year, but isn't planning on staying in the house very long. The basement pipes were all galv, and a makeshift shower in the basement had the hot water feeding into the cold water for the kitchen. The cold water for the kitchen was completely blocked by the sediment, so you'd always end up with a warm to hot glass of water.
My father and I reamed out the pipes in the basement and it was enough to get another 10 years out of the system. Looking back, a repipe would have been the right thing to do, but we would have had to get the water shut off at the street as the inside shut off was stuck to "on".
It was a huge mess and we used up all her wire hangers and several drill bits, but it fixed the problem.
(no, I'm definitely not a plumber)