“You will destroy them as you destroyed Jericho and its king. But this time you may keep the plunder and the livestock for yourselves. Set an ambush behind the town.”” – Joshua‬ ‭8‬:‭2‬ ‭NLT‬‬

This is sad for Aachan. Though it was not guaranteed, if he had waited for a little while he would have gotten all that he sought from Jericho and perhaps even more from Ai without the curses and death. Stories like these are useful to remember that impatience can bring destruction, but also less than one would get otherwise. Be patient.