I would encourage everyone, before deciding how they feel about accumulating wealth, should spend a few weeks in a third world community (and I don't mean at a tourist resort in Jamaica or some other Caribbean nation) and experience what poverty looks like. If, after having done this, you can honestly say that you feel that your time, money, and resources are best used to enrich yourself and improve your own quality of life, then who am I to judge? All I can suggest is that all wealthy believers (and by wealthy, I refer to everyone here who has a roof over their head, at least one meal a day, reliable electricity, a computer with internet access -- even if borrowed from the library, etc.) should at least make themselves aware of the reality of global poverty (which is entirely different from 1st world "poverty") in making decisions about how they feel about the accumulation of wealth in their Christian walk.
My trips to Nicaragua have had a profound impact in how I think about these things, but I know that now everyone's experience is the same.