members and their systems

for the short time I have been on here, I see that members will start a thread asking about a certain piece of equipment or speakers..       they will then buy that piece of equipment / speakers, start a thread about it saying how good it is and then next thing you know, they are starting another thread asking about another piece of gear as they are looking for something different.           what happened to that piece of gear that was so great ?       
  i get the whole buying thing....but where are members getting the money to do all of this stuff ?       do they not have other bills such as rent / mortgage payment, car payment, other bills to pay for also ?