Expenditure on a timepiece is definitely affected by one's income. It is interesting because different people have different views on how much should a watch be worth the buy. If you're a multi-millionaire who have no interest in watch collecting or the habit of wearing a watch, you might not pay RM110,000 for a Patek Phillipe 5712/1A while a millionaire watch enthusiast would.
From a personal point of view, i think if you want to make your money worth while, spend at least RM10,000-15,000 to get a watch that's worth keeping, for example pre-owned Rolex Submariner, Explorer II, GMT-Master II. Either save up or spend that amount if you are well off enough. But again, like i said different people have different views, so some might be willing to fork out RM10,000-15,000 to buy a brand new Tag Heuer Grand Carrera or Omega Planet Ocean because it suits their taste and style.
A decent watch should be worth at least the amount i stated. It is actually a good amount to start with if you're a beginner watch collector, then slowly upgrade to more expensive watches as you learn more about watch market.