1. It is viewed as sin to take your own life, some sects of Christianity even see it as unforgivable, although I vehemently disagree with that. Life is good in that God declared it good, and ending it would be wrong. The topic of suicide/life/being created in the image of God is a huge topic in Christian theology and entire libraries have been written on it. The incentive to stay home, in a nutshell, to bring glory to God by the way you continue to live. Its a good question though, one I hadn’t thought very much about previously.
2. churches have closed their buildings because, believe it or not, we so think scientific research is a thing, as we do take health seriously. Although the buildings have closed their doors, it is important to note that the church is not a building it is a group of people. There is no magical power in a building. Most churches are doing online sunday meetings, and most are also serving their communities by offering different ways to support people in need during the quarantine period (practical things like getting groceries, sharing supplies that are in demand, etc)
3. i don't follow the train of thought here. Churches (as a whole, I understand there are some major outliers who do take advantage) do not operate like a business and are not looking for profits. As far as serving communities, The churches are simply adapting and finding new ways to service the community. There’s a learning curve right now, and some are quicker to adapt than others (reflection on leadership abilities within the individual churches - not just pastors but members as well).