I have to agree with most of what Vivace said. Let's not forget that Paul led a lifestyle very much like Jesus' where he traveled around with little money beyond what he needed for the bare necessities, and that he also wrote that "the love of money is the root of all evil."
Also, to try to limit Jesus' teaching only to focusing on the imminent coming of the kingdom and not on Christian living is missing a lot of what he taught. Yes, there was a lot of emphasis on the coming of the kingdom. But he also taught considerably on how to live once the kingdom came, and he taught that his apostles would have the job of continuing to teach how to live once the kingdom came, which is exactly what is recorded in Acts and the N.T. epistles.
In my opinion (and it is strictly opinion, since we are not told definitively in the text, although I believe there is more than ample indirect evidence to support this position), another aspect of the money issue in addition to what Vivace mentioned above was the historic reality of what would happen in Jerusalem immediately after the arrival of the kingdom: namely, there would be a large concentration of new disciples staying there for extended periods of time who actually lived somewhere else. As a result, there was not enough food, etc., to take care of everyone, which is why we see in the first 5 or so chapters of Acts people selling their possessions and donating the proceeds. And apparently, this continued, because later in Acts and in many of Paul's letters, Paul is recorded as taking up a collection from churches in other areas to take care of the Christians in Jerusalem. I think this also very likely factored into what Jesus was teaching on not loving money and of repeatedly during his life giving the example of giving to the poor. There was about to be a very large-scale, immediate need for a lot of people to have to do so.