It all depends on when the house was built? At one point it was common to only have one 20 for the kitchen for the iron, and one 15 for the lights. Check to see if the house was built to past codes, and safely. Upgrading to todays code, is not nessarary to sell the house. I love these "Home Inspectors", who rant on about 2-wire "un-grounded outlets", as they weren't always required, and not nessesarilly a safety hazard. IMO
Many people when buying a house like to just move in. Not renovate... And pay more for that! Some people want to buy in cheap, and dont mind doing some up-grades. Its a fine balance. If the cost of renovation or up-grades is lower than the return for a "move-in house", that is money made, not spent. Its a gamble....
"Well - I oughta....." -Jackie Gleason