"Timing the market is a mugs game"
Not my expression but one often repeated on this site.
Timing the market by definition is attempting to predict future price directions, usually by examining past and recent prices.
Anyone who invests in property with little or no yield is buying
based on a hope that property prices will continue upwards based on past performance and is therefore playing the timing game.
"Timing the market is for gamblers" : I think I'd prefer this but it just doesn't have the same ring to it