I don't can read here that JW's are forced to not buy a house..
Of course not !
The implying suggestion is that seeking material wealth to pay for homes isn't really putting Godly things first.
Putting so much time and effort to pay for your own home, is time taken away from service and pioneering.
The other thing the WTS. doesn't equate as something important is saving up for retirement, that too is a waste,
since money and will be useless in the new order.