This is not about telling a pilot/owner that they should not buy a GPS if the airspace they fly in warrants it, if you need a tool, for sure, get it and use it well.
But, if your flight is adequately equipped for the flying you typically do, consider investing in more training/recurrent training before you invest a fortune in equipment which is redundant, or simply not needed. Do not claim to be too poor to afford good training, with a cockpit full of stuff you really don't need, nor know how to use well anyway....